Aika, a flashy but homely housewife whose husband, despite their good relationship, does not help with child-making, is growing increasingly frustrated. A greasy, single old man moves into the same apartment complex as Aika. In an attempt to distract herself from her frustration, Aika engages in masturbation, only to be caught in the act by the old man, who has come to greet her after his move. The two, who should never have crossed paths, begin an intense affair, drenched in sweat, triggered by this embarrassing incident.
