BNHA: Kakashi dimension hops crossover (8)
Summary: Kakashi gets dumbed into the My Hero Academia universe through random plot devise.
Characters: Â Kakashi Hatake
Fandoms: My Hero Academia and Naruto
WARNINGS: Mentions of violence/injury
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The view from the window in Wadaâs office is of tall, glass covered buildings and what must be a railway looping around them. The train that zips along the tracks travels at speeds far surpassing similar technologies available in the Land of Snow. The Land of Snowâs chakra rich atmosphere allowed its trains and other technology to run on a mix of chakra and steam generated electricity. It was a combination prone to overheating and blowing up, meaning it was only really viable in cold climates. Kakashi hadnât cared enough to follow up on the Land of Snowâs rail system after delivering the initial intel to Konohaâs intelligence division. Large scale infrastructure was only an asset in a country so isolated that there was no major risk of it getting targeted by enemy nations. The speed of the trains in Hosu have him reevaluating that assessment.
âHatake?â
Konoha used steam to generate its own electricity as far as Kakashi was aware, the specifics of which escaped him. All he knew was that it was resource intensive, its exact location was marked âneed to knowâ and only half the villageâs buildings were connected to it. The power generation system used to move Hosuâs trains at such a speed might be worth investigating. It was obviously more efficient than Konohaâs system if it powered the train and all the infrastructure around him.
âHatake?â
Kakashi shifts his gaze back to Wadaâs office and away from the city, propping up his elbow on the arm of his wheelchair so he can lean against it.
âHatake,â Wada crosses his arms, pushing back on his chair so he rolls out from behind his desk, âAre you listening? If youâre tired, we can have this conversation tomorrow.â
He tilts his head to the slide to meet the doctorâs disapproving stare. Â
âYou want my personal information for a residency application. We were also about to run through my diagnosis and tests results,â Kakashi idly summarises Wadaâs last few minuets of lecturing. âI would like to hear what the quirk specialist has to say about my quirk,â he adds, trying to inject a little enthusiasm into his voice so he is not immediately wheeled back to his room for another week of rest.
âPlease call me Kakashi,â he throws in as an afterthought.
âYes. Yes. Kakashi then.â Wada waves the correction away, âIâm going to need more than a name if you want further aid from the City. After your discharge youâll be left high and dry at this rate. Donât think I donât see you trying to avoid the topic.â
Wadaâs irritation has Kakashi nodding along for good measure, prompting the doctor to continue talking with a sigh of mild frustration, âThis is all quite complicated. At the moment, youâre being treated under Tokyoâs District Collateral Damage Scheme which would usually extend to relocation, occupation support, and asset recovery. However as the investigation into the attack on your person hasnât linked it to any credible Villain activity, youâll need to be a resident of Japan to receive further support.â
Wada frowns at him, âThatâs a problem seeing as we see canât find any of your records.â
âHmm,â
âYou have no birth certificate, citizenship information, school records, place of residence, career history or passport,â Wada lists, âAre you absolutely sure Hatake Kakashi is the name we need to be searching under?â
There is another pause where a reply would usually go. Kakashi finally lets his full attention sit squarely on Wada, taking in his mildly irritated expression and how his eyebrows are drawn together in a slight frown. The man is leaning forward, arms crossed, irritate but keen for a response. Kakashi habitably scans for signs of deception.
âWhy.â Kakashi finally asks, voice dropping flat as be briefly lets his suspicions seep into this tone. Â The medical attention he could understand. Doctor Wada was being paid by the hospital to give him medical care because of its poor patient vetting. This other help wasnât medical attention. Kakashi wasnât Wadaâs friend, ally, or family member. He doesnât have ties to the man outside of being his patient and he knows Wada doesnât pay this much attention to his other patients.
Wada huffs, throwing up his hands, moving from vaguely annoyed to openly exasperated. If Wada hears the underlining threat in Kakashiâs question, he wilfully ignores it.
âYou walk out of hospital like this, and youâll be jobless on the streets by sunset. Rent. Jobs. Bank accounts. They all need identification. Best we get this sorted while you still have access to the hospitalâs resources.â
âAnd you do this for everyone?â Kakashi asks sceptically, because Wada has obviously misunderstood him.
âHumph.â Wada grunts, âMost of my patients have relatives and friends visiting every few days and arenât missing all their personal records. Helping people isnât just for the Heroes you know. Us regular people like to give it a go every now and then as well.â
Kakashi stares as the man gives a resolute nod like his had given a valid answer to Kakashiâs question. Â What did being a Hero have to do with anything?
âI see.â Â He really didnât but maybe this was a normal doctor thing to do? This world was so strange.
âUnfortunately, I donât remember anything else of use,â Kakashi repeats. It was probably the most truthful he has been since waking. Kakashi has no further information for Wada revenant to his lack of records.
âYes, very unfortunate,â Wada sounds ever so slightly disappointed, âunfortunate for you. Iâm not a miracle worker. Youâre going to have issues with this lack of records.â He rolls back behind his desk, yanking out a stack of paper held together with thick metal clips. As he shifts objects on the desk around to clear space, Wada continues, âI might be able to get you a job interview with a friend of mine and I might be able to get you into some city subsidized housing. But thatâs an iffy mightâŚall I can promise.â
Never mind that Kakashi hasnât asked for anything since his arrival.
Wada slaps the stack of paper down on the desk flipping it in Kakashiâs direction and sliding across towards him. âYou can show your appreciation by paying attention. Your medical records are the only thing we do have at the moment.â
Kakashi examines the booklet, raising a questioning eyebrow. On top of it is one of those plastic communication rectangles. Phones. It is black with a black screen.
âThis is my old phone, no sim card but youâll be able to connect to the Hospitalâs internet. Iâll see if I can get you a charger tomorrow and set you up with patient access account.â
Wada moves the phone to one side.
âThis is youâre recovery plan. I took the liberty of printing it out for you. Though with your quirk itâll probably be a waste of paper.â Wada follows the sentence up with a quick, âOnce youâre cleared to use it. Which youâre currently not. Donât even think about it.â
Kakashi raises a hand in a loose calming motion.
ââŚand on the topic of your quirkâŚ.â Wada fusses around, patting himself down muttering, âWhere is it. I swear if I lose another penâŚAh.â He pulls out a pen, leaning forward to scribble out a line of numbers and letters.
âYouâre Registry ID. Wonât be for active for another week at least. But, once it is, if anyone gives you trouble for using your quirk in public you can tell them to go look up your file. I sent all your information off to be assessed and your quirk is probably going to be registered as âpassive biologicalâ which is an automatic Licence Waiver if Iâm remembering my law correctly.â
âDonât quote me on that. Iâm a doctor, not a legal professional. And just because you can use it, doesnât mean you should. High Stress quirks need to be carefully managed.â
Wada reaches over and flips the booklet open, tapping the page.
âYour quirk puts a huge strain on your brain. Specifically, it strains your memory and vision processing centres. The expert opinion is that your bodyâs fast regenerative factor has naturally evolved to offset this physical stress.â Wada hums, pausing in his explanation to check that Kakashi is following. âUnfortunately, even with this mutation your quirk is maladaptive at best actively destructive at worst.â
Kakashi glances at the page Wada is scribbling on. It has a diagram of a brain with serval areas now circled in blue pen ink.
âSee this area here. This shows high activity. And see how it how activity increases when your quirk is active.â Wada flips the page, âAnd then activity in these outer sections of your brain drops to practically zero? None of this is good in the long term.â
Wada clears his throat, âA lot of your bodyâs resources are being devoted to vision and memory processing and it has led to enlargement and increased activity in these areas. This sort of imbalance in the brain has been connected to depression, paranoia, anxiety, chronic stress and panic disorders. Something youâll need to keep an eye on it and I have noted on your registry file when it comes time for your annual quirk check-up. I have also taken the liberty of scheduling some initial psychologist appointments with Hosu General.â
All this sounds somewhat familiar. He thinks in he has ben given similar warnings about sharingun and dojutsu users being more prone to severe paranoia episodes by medic-nin.
Honestly, with the rate Uchiha went loopy, he is not surprised to find out that the sharigun messed with the brain in other ways. He had always just chalked it up to the unpleasantness of having to retain perfect memories of comrades dying gruesomely.
Of course, he had never hung around the hospital long enough to get a proper diagnosis and assessment of his sharingun beyond an understanding that he should keep use to a minimum. The Uchiha had had their own medical centres for sharingan related ailments which heâd been unwelcome in before they had all disappeared along with the clan. Not like knowing meant much in the long run. It wouldnât stop him from using it. The sharingan was the most powerful weapon at his disposal. Better to overuse it and suffer hypothetical future consequences then underuse it and watch his allies die.
ââŚand there is no cure for this?â he asks to cover his bases because he wasnât the only shinobi with a dojutsu that messed with brain activity and maybe this strange world had something useful to bring back.
âUnfortunately, research into ocular quirks is still in its infancy. However, these sort of maladaptive characteristics arenât uncommon in third generation quirks. An unfortunate result of a quirk mutating quicker than the body can handle or an individual inheriting a quirk from their parents but not developing the accompanying physical mutations necessary for that quirk to function properly. For now, your memory loss has been diagnosed as an Externally Triggered Quirk Incompatibility Event resulting in detriment or damage to the quirk user. ETQI Events are quite common in individuals with high stress quirks.â
The way Wada waits again for Kakashi to respond is more evidence towards his growing suspicion that Wada was beginning to doubt that his memory loss was as extensive as he had been implying.
This time Kakashi doesnât answer because his attention is pulled away to focus on unusual movement above the city.
A large bat-like creature flashes across the now dark sky, diving in between the buildings. Since arriving in this world Kakashi has seen serval types of loud flying vehicle hovering or passing over the city. Enough to have grown use to the sight and sound of them passing overhead. Nothing this large and organic and this creature was definitely organic.
âKakashi? Are youâŚ. What in the world?â
In amongst the buildings there is a breif flash of orange light, and a trail of smoke can be seen raising upward. Despite it being mostly obscured by the tall structures, Kakashi knows an explosion when he sees one.
Wada stands abruptly, âOh myâŚthatâs the city centre,â he pushes around his desk so he can stand next to Kakashi.
There is another flash of light and the creature shoots back into the air above the buildings. Wada startles at the sight. So large flying creatures arenât a normal occurrence for Hosu. Good to know.
â-Announcement; all staff refer to personal devises. Event level 2.-â can be heard through Wadaâs office door, the announcement coming in from the hallwayâs intercom. Wada is immediately distracted searching his pockets. Â
âA Level 2? In Hosu?â Wada questions, staring at the screened devise â phone, Kakashi mentally corrects- he frees from his pocket, reading through something. Emergency orders from the hospital.
Kakashi notes the alert as he flips up the soft medical eyepatch and pulls off the bandage-tape covering his sharingun so he can better track the creatureâs trajectory across the darkened skyline. The fact that Wada isnât yelling at Kakashi about his sharingun use tells him that a Level 2 is serious business.
The creatureâs flight is sporadic, like it has sustained an injury to one of its wings and trying to escape whatever caused it. The creature is also on a collision course with one of those highspeed trains Kakashi had noted earlier.
â-Announcement; all staff refer to personal devises. Event level 2.-â
Kakashi watches, his sharingun catching the moment the creature rams into a train in perfect detail even at the considerable distance. The side-carriage buckles inward and the train is flung partially off its rails, momentum abruptly slowing.
He canât hear collision at this distance, but Kakashi thinks the hospital building tremors ever so slightly. Whether the tremor is from the train crash or another explosion closer in the city he canât tell.
At this point Wada has stopped staring at his phone and is following Kakashiâs line of focus. The man inhales sharply in alarm, rushing forward to press against the window.
âThatâs the main line!â
â-Announcement; all staff refer to personal devises. Event level 2.-â
Cautiously, Kakashi stands from his wheelchair to follow, approaching and eyeing the train and then the city. He can pick out four smoke trails wafting up from among the buildings but nothing is close to the hospital. Yet. In a citywide attack a hospital is a logical target.
The flying creature falls away from the smashed-up side-carriage like it has been blown backward by a powerful shockwave. It flounders in the sky for a second, disoriented, raising higher then dropping into uncoordinated wonky dive. Of course, the dive puts it in line with the hospital, his eye allows him to make the calculations automatically, tracking the trajectory.
It is on a collision course with the section of building Kakashi is currently occupying. If the creature didnât slow or turn, its impact with the building would probably take out a portion of the upper floors, including Wadaâs office.
A little chakra enhancement and Kakashi kicks the glass from the window in front of him. It was best not to retreat into the hospital as he doesnât know if the buildingâs structure was sound enough to withstand the collision. It was a safer bet to escape outside where he would have more room to manoeuvre.
The window shatters, glassing spraying out and falling onto the pavement that ran the perimeter of the hospital.
âHolly SâŚ. âWada begins to exclaim and is interrupted when Kakashi snags the doctor by the arm and throws the man over his shoulder, winding him in his haste. He then turns and in one sweeping motion swipes his recovery plan and phone off Wadaâs desk, crouching fit through the window frame, and jumps, dropping straight down.
There is the loud crunch and screech of metal and glass twisting up above him as the creature rams the side of the building. Kakashi lands and darts further along the path and away to avoid falling brick and glass.
Around him the civilians, who had been distracted staring at the explosions and smoke rising from further in the city, turn at the noise created by the impact. Then there is a lot of panicked yelling as people scatter in all directions.
âBack away! Move away from the wall! Please stay back from the road!â Two uniformed policemen come jogging towards the crash site, unsuccessfully attempting to re-direct the streams of fleeing people. Itâs a lot of uncoordinated chaos as people spill out onto the roads around the hospital and get in the way of oncoming vehicles which subsequently crash into one another.
It is all very chaotic up until a short grey-haired man in a yellow onesie drops to the pavement few meters from where Kakashi had initially landed, right under the flying creature. Yellow-onesie-man turns to order the policemen to keep civilians back before propelling himself up the building in long leaps worthy of any respectable shinobi, kicking out and knocking the creature off the building, manoeuvring around several uncoordinated retaliatory attacks. A âpro-Hero,â Kakashi decides, tracking yellow-onesie-manâs quick decisive strikes and dodges. He had noted that Heroes tended dress bright and flashy to attach as much attention as possible. Â
It obviously works as, around him, the civilians who had previously been fleeing in blind adrenalin fuelled fear seam to calm, focusing on yellow-onesie-man and his efforts to redirect the creature away from the hospital.
Kakashi watches the fight long enough to confirm that it was not headed in his direction. Relatively certain he is not about to be suddenly attacked or rammed into by the panicking crowd he loosens his grip on Wada, bending to let the man down. Kakashi slouches, attention split between his immediate surroundings and tracking the fight as it moved out onto the road.
âOffices,â Wada, who had been uncharacteristically silent, exclaims. He stumbles back and plonks down onto the pavement, landing on his ass, âThose are the third and fourth floor are offices,â The man is staring up at the damaged upper floors of the hospital. âItâs afterhoursâŚthere wonât have been anyone workingâŚI should have been the only one in this late,â he mutters.
Kakashi habitually scans the structure. The damage isnât bad all things considered. There is a lot of broken windows and a significant hole on the fourth floor, but it is shallow, only penetrating a few meters into the building, meaning the flying beast had attempted to pull up at the last second, lessoning the impact. Probably hadnât managed to smash through any of the supporting walls so they wouldnât have to worry about the building immediately collapsing. The third floor has broken windows and damage to the outer wall which wasnât dangerous unless you were standing right next to the glass at impact.
âHmm, probably no casualtiesâŚthe rooms on the fourth floor are empty. Aside from us,â Kakashi confirms. He had stalked the doctor enough to know when there were and werenât people in the rooms surrounding his office. The air also lacked that strong stench of blood that so often accompanied a person being crushed by rubble. Even the stink of this people-filled city wouldnât have been able to block that out.
Wada blinks up at him. âHow did you get us down here so fast?â
âI believe I jumped.â
â⌠how in the world does a memory quirk let you land a four-story drop on a leg that is still injured?â
Kakashi gives a bland smile, scratching his chin thoughtfully, âYou know what, I donât know. Must be an ETQI Event, you did say it affected memory.â He holds up his recovery plan for emphasis.
Wadaâs response to that is silent, open-mouthed disbelief.
âI should have retired last year and followed my sons advise. Iâm getting too old for this,â the doctor finally mutters, rubbing his eyes, hand shaking ever so slightly. He lets out a long breath.
âYouâre not injured, are you?â Kakashi asks, reminding himself that Wada is a civilian without chakra and thus doubly susceptible to injury.
Wada makes a show of checking himself over, âNo. I suppose Iâm not. Aside from the heart attack.â
âIsnât that good news.â
âOh yes, wonderful news,â Wada huffs, âAlways good news when my patient who shouldnât be walking jumps out a window to save my life.â
Kakashi hums, watching the man struggle to stand. All shaky. Adrenaline would do that if you werenât used to it.
He bends and grabs a hold of the doctorâs shirt to pull him to his feet, holding him still for a second until he was sure Wada could support his own weight. Aside from looking a little windswept the man is no worse for wear.
Once standing, Wada finally takes proper stock of his surroundings, âWell, isnât this terrible.â
By now the Hero has drawn the flying creature down the road and far enough away from the building that a number of the hospital staff are rushing out to inspect the damage. Several alarms are sounding in the building at varying levels of shrillness, there is the loud crunch of metal hitting metal as the Heroâs fight knocked into hastily abandoned vehicles, and behind it all people are yelling instructions and questions at each other.
âIâm going assist with any evacuating or patient care where I can. You need to follow the directions of hospital staff and get yourself settled somewhere safe. We can discuss all this later,â the doctor orders as his shakiness dies down.
âHmm.â
Kakashi flicks open his recovery plan, sharingan stamping the information into his brain. He would devote some time to considering it later. Now that the catâs out of the bag he doesnât need to worry about maintaining a façade in front of Wada.  Quickly, he flips through the booklet. The whole process takes barely a minuet.
âThank you, but I think Iâll be off,â Kakashi says simply, handing his recovery plan back to Wada, âyou were right about the waste of paper.â
Kakashi pulls the eye patch back over his eye, turning away from the hospital. âIâll keep this though,â he holds up the phone.
As he begins to wonder away, Wada splutters, âWait. Where are you going?â
âMah,â he waves a hand lazily without turning, âIâm going to find my memories. Iâve lost them on the road of life and I need to retrace my steps.â
In some ways he is glad to have had this opportunity to save Wadaâs life. It meant he could walk away without feeling indebted. It was also the push he needed to finally make a decision on what he wanted to do with three years of prospective down time. Explore this world a little. Gather intel without having to worry about hospital staff and other civilians getting in the way. Watch everything from afar for a while before trying to seriously integrate in with the locals. Find somewhere secure to get a proper nightâs sleep and to properly start experimenting with his chakra and other potential ways home. Idly, he scans the road full of stopped cars and scattered civilians, picking a direction that would take him adjacent to the Heroâs fight. This would be a good opportunity to observe Heroes and see quirks used in proper combat.
âYouâre not even dressed properly?â Wada calls after him.
âMy first stop.â Of course, he would need to acquire a set of cloths that werenât a hospital gown, pyjama pants, and flimsy slippers.
âHold on a second,â Wada hurries around to stand in front of him, forcing him to stop. Kakashi arcs a brow at the forwardness.
âWhatever trouble you were in before now doesnât matter. I donât care enough about the memories you may or may not have or your quirk. Iâm too old to worry about all that stuff these days. Youâre young enough to deserve options. Think about it. A sensible job and a place to live. Sure, itâs not exciting, and it all gets a bit dreary every now and then but itâs a far cry better than bleeding out in an ally after being stabbed in the chest.â
Kakashi eyes the man not bothering with a smile. He lets his stare stay bland, face expressionless in that way that would have any sensible person dropping the topic of conversation.
Wada keeps talking, âIâve seen plenty Villains find their place in society and make honest men of themselves. Not exactly easy but it is doableâŚwith help. Help the hospital can give you.â
AhâŚthis man was like Naruto in a way⌠heâs concocted some backstory for Kakashi that likened him to this wordâs version of missing-nin and is now attempting to reintegrate him whatever passed for a hidden village here. He is still parcelling out the details on how everything fit together in this world but he thinks he has this analogy somewhat correct.
âThat wouldnât quite work for me,â Kakashi loosens, slipping around Wada fast enough that the man stumbles, hopping up onto the roof of a crashed vehicle so he can jump between them and more easily cross the road.
âBye bye.â

















