Rosewood

Waka is a teenage girl with the eyes of a God. She lives in an apocalyptic era, decades after the first Gods fell to Earth. A World War is on the horizon, because these Gods don't like humans. They poison fertile land, and they turn the living into salt water. They want to keep humanity far away from them.

Alula is a "reincarnated God" inside the stolen body of a girl named Waka. That God is obsessed with a human girl who recently died. Waka thinks the Gods killed her beloved best friend, but she (Alula) is most likely the God who did the deed.

Waka and Alula are not the same. Alula is confident, powerful, and fascinated with the blood of her beloved "best friend", Shion. Waka is a normal teenager, who desperately tried to comfort her best friend when she was being abused at home. Alula's relationship with that unfortunate best friend was beyond toxic.

Alula's best friend and favorite human desired death. She wanted to see a beautiful God before her death. It's very likely that Alula revealed her true form, and Waka just has no idea.

Her story gets put on hold though, while we establish this apocalyptic world, and how grim it is.

Both of these bodies are a Snake God. Hebigami is his real name, but he responds to Minami and Obikawa. He responds to these names depending on who he is speaking to. He is in love with Minami's wife, and Obikawa's best friend is named Tokinaga. He feels attached to the woman Minami loves because he ate Minami, and hence became him.

It is dangerous for Gods to eat humans, because it makes them unstable and emotional.

Hebigami intended to kill the humans, but his Obikawa form became friends with Tokinaga. That weakened him and eventually led to him eating a human who was deeply in love.

He stole the body of Minami with the intent to use it to sneak in and kill more...but instead...

He learns what "attraction" is and he falls in love. He still feels this attraction in his other forms. He can't kill Yoriko as well. Not even if he tries. When he thinks about killing her well...he thinks about her and his desire to kill fizzles out. He's still mostly free of empathy. There are only "special" exceptions, and the two humans he favors don't exactly get treated luxuriously.

They go through hell.

He kidnaps Yoriko and he chains her up, like a classic yandere. Previously he hated Yoriko and Minami, because they dared to steal parts of his original snake body to experiment with. Now, Minami is him sometimes and he has a wife. He also...enjoys it? His personality isn't like Minami's. He just loves what Minami loved when he was alive, and Minami's cells are part of him.

That's why the Gods usually turn humans into salt water.

It's to prevent emotional infections.

Eating a human is awful for a Gods overall health and purity.

Yoriko adored her husband. She knows his cells are alive, so she vows to get him back, out of the snakes belly. Technology has mingled with unnatural things during the apocalypse.

It could be possible.

Hebigami is abnormally excited when he falls in love. He enjoys it, even though he doesn't know what it is. He doesn't even know what a wife is. These Gods have no clue how procreation works.

They just...are, and that makes their emotions very intense. He poisons her, and he gives her an antidote every morning, so she can't escape from him.

Hebigami decides to protect a certain slot of human territory after he "gets married". Another God explains that he's a lost cause, infected by human emotion. He's still powerful though. Hebigami becomes humanities first real weapon against the other Gods, after 30 years of struggling.

Yoriko figures out that the Gods are like children when it comes to emotion. They don't smell or taste or emote like humans do, so having a human form is overstimulating for them.

Hebigami wants to share his feelings. Yoriko visits her child's grave. She lost them during the long apocalyptic wave.

Hebigami eats the bones that are left, because he wants Yoriko to like him more.

He also wants her child's remains to be preserved forever, because she loves it.

Even though its dead.

Hebigami didn't eat someone that liked hanging out with Tokinaga. He just genuinely likes his best friend. He eventually agrees to be a weapon and teacher for humanity.

He did think about eating Tokinaga, but he would miss Tokinaga.

This is only a hint at the future. We don't know how many gods are currently living in human bodies. Some look monstrous, because they aren't infected by emotions. The purest are trying to make the entire Earth barren, to get rid of the human disease.

If not sure if anyone will win this war.

Too much is already lost.