Yūri Amagake, an unhappy high school girl who hates the word "accidental", is one among the people gathered in a mysterious organization like Akira. One day, Yūri dies as she tries to help a man on the building's roof on the verge of throwing himself. Her first program is a 1 v 1 duel. Yūri, confused by the unexpected behavior of her opponent, is forced to fight against her, but she vows to clear the game to return to the girl she lived with.