Following the events of the game, the orphan heroine Hinako Nakayama suddenly reunites with her twin brother Hikaru who asks her to take his place at Shishiku Academy, a private boys school infamous for its rough-and-tumble student body. Hikaru being the child of a powerful Yakuza family, the Onigashima, he is obligated to become the leader of Shishiku Academy. Hinako will have to hide her id...