Tatsuo Mayumi is a college student living alone in Tokyo. Due to certain circumstances, his aunt Hitomi Enjo and her son Yasuhiro Enjo end up staying with Tatso's mother, Azusa Mayumi, at their family home. Originally planning to bring his girlfriend home for a visit, Tatsuo instead becomes overwhelmingly aroused by his mother, ignoring his original plans as he repeatedly indulges in sexual acts driven by his fantasies. Meanwhile, Yasuhiro subjects his own mother Hitomi to inappropriate clothing and exerts control over her appearance. This story unfolds the complex web of familial relationships and repressed sexual desires within the household setting.