Mayuki and Yoshio, a student at the same university, start dating and live together six months later, but one day they find out that Nakata, a delinquent senior from Yoshio's hometown, has moved near where they live. Yoshio was bullied in middle school, so Nakata is unable to resist, but he takes a liking to Mayuki and tries to get in the way of their romance at every opportunity, planning a drinking party at Yoshio's house to get Mayuki.