(This is gonna be long. I am so sorry. I am just very passionate about C!Yuki)
In regards to your last ask, Akuma Academy started out somewhat connected to YHS, taking place somewhat after/before. But it was never explained more than that. Eventually, halfway through that series, CC!Yuki himself stated that was no longer the case. And it seemed to stay that way.
HOWEVER! In his third series, Moncher High School, C!Yuki reveals in a conversation with Maria (the recurring antagonistic force of all Yuki's rps) that YHS did happen, and when Yuki died, she sorta got sent to another timeline.
MARIA: "And he broke your heart, didn't he... That's when I woke up, ya know. I felt it. In your heart.
YUKI: "Maria, that-that time... I had no other choice but to jump. And now I'm back in this world-"
(Moncher Academy #83 "The Truth.")
C!Sam breaking C!Yuki's heart is canonically what woke up Maria in Akuma Academy.
The timeline jumping stuff was established as a demon power before this big reveal, when Yuki's mom, Lilith, was first introduced in Akuma.
But if that small line isn't enough to convince you of the timeline jumping shenanigans being canon, C!Yuki actually fully explains her story to children in the following series, "Day Care Time-Leap", when her demon powers accidently put her in her 6 year old selves body.
YUKI: "...I fell in love with a Bunny Boy, I tried to kill all his friends, then Maria woke up cuz he broke my heart..."
(Day Care Time-Leap #29 "A HAPPY FUTURE!")
Here it's (kinda) revealed that the timeline Yuki went to after YHS is actually her real timeline, and she only went to YHS's timeline after running away from her mom, who took her away from her dad during a fight. This was also when she first killed Maria.
(I say kinda revealed because it was already implied when her parents showed up in the previous rps, but here it's finally confirmed)
Sooo yeah. Think of it this way, Yandere High School is canon to Akuma->Time-Leap, but Akuma->Time-Leap isn't canon to Yandere High School
[[Also in CC!Yuki's latest roleplay DeviDevi Academy, where C!Yuki finally dies and goes to hell, she brings up how she's died before, referencing YHS's ending-
YUKI: "...everytime I would die- ya know, someone has accidents! Sometimes you jump off a roof, sometimes you um..."
(DeviDevi Academy #3 "THIS PLACE IS AWFUL!")
-BUT MAKE OF THAT WHAT YOU WILL! I'm just saying all this cuz I love SirCutieYuki and his roleplays, and I love how it Yandere High School is the catalyst for C!Yukis path to self redemption]]
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