Maiyuki, who started dating Yoshio from the same university, moves in with him after six months. One day, they learn that Yoshio’s delinquent senior from his hometown, Nakata, has moved nearby. Yoshio, haunted by a past of being bullied in middle school, can’t stand up to Nakata. The intimidating Nakata takes a liking to Maiyuki and constantly interferes with their relationship, scheming to make her his own by organizing a drinking party at Yoshio’s place.