the story starts of with a guy sitting on top of hellish rock place and talks to himself that his time has finally come, the scene then cuts to a another guy named yumi waking up from a nightmare and refreshing himself to go to school. while eating breakfast , he listens to news stating that a psycho killer has escaped from prison. he just ignores that news and goes to school, on his way to school, he has a strange feeling , the people bypassing look different like all of them show some sort of evilness in them, as he finally arrives at school, all the crepes in his class start to bully him, as a result he gets beaten up for speaking with a girl named hotaru shiina

around second period, an announcement is made" let's play a game" and the next second

a masked stranger enters the class with a gun

everyone in the class got freaked out and yumi was the first one on his knees, everyone got on their knees except one, haruto one of the bullies who beat up yumi that morning,

he refused to surrender, the stranger pointed his gun at haruto, even though scared, haruto refused to surrender, as the stranger tries to pull the trigger, yumi remembers his worst nightmare , he sees his father getting shot by gun, yumi beats the shit out of him, and makes him spit out information about how many members have abducted the school, their weapons, etc. then he attacks each one of them separately but before taking out the main psycho killer, he got shot. he was at verge of death then suddenly he feels a surge of power flowing through him and defeats the psycho killer, after that he got hospitalised and he doesn't remember how he defeated that killer, as he was thinking about these stuff, haruto enters the room and thanks yumi for saving him