The protagonists are going be hiroki from kokujin no tenkousei
The other protagonist will be kenta from discipline
So the story will have them being teenagers and they already experience what happen to them in there stories.
It shows them living there life after there family betrayal and they try to forget about them as they move on with there lives
But they get hit with canisters that turns them into monstrous animals (this will take elements from the movie and game)
Hiroki the giant gorilla monster
Kenta the giant wolf monster
They can also switch between to human and monster what ever they what to but they have to figure it out first.
The story also shows what happen to hiroki's family/girlfriend/ best friend and kenta's mom after they left.