Yui, a fresh graduate and newly appointed teacher at Ataka Academy in the Onishime district, witnesses a male student named Kurosu bullying his classmate. Despite being warned, Kurosu shows no remorse whatsoever. Yui consults a senior teacher about the matter, but they only tell her, "Please, whatever you do, do not get involved with Kurosu. It's for your own sake," leaving her alone and bewildered...
