Mika Matsushita, wife of the Matsushita family, and Yuki Kikuchi, wife of the Kikuchi family, lived next door to each other and often spent time together while their husbands were away on work assignments. One day, Yuki's husband suddenly fell ill, forcing her to leave her son, Masayuki, in the care of the Matsushita household. Before departing, Yuki mentioned offhandedly that Masayuki was still a virgin—an innocent remark that planted a provocative idea in Mika's mind. Unable to resist her growing desire, Mika gave in to temptation. Within hours, she would give Masayuki an experience he'd never forget.