At the first reunion since graduation over a decade ago, Sakura cannot stop thinking about Yusuke, her first boyfriend, and he feels the same. Though both are married with families, neither ever deleted the other's contact details. Back in school they were too innocent even to hold hands, but now they are grown adults. Yusuke loses himself in Sakura's beautifully matured body, while she cannot suppress the return of her first love despite knowing their double affair is wrong.