Yuka Osawa plays Mina, a married woman who, at her husband's promotion party, finds herself kissed by Sawamura, her colleague and former classmate, while her drunk husband sits beside her. Sensing her emotional vulnerability from their prolonged sexless marriage, Sawamura's desire begins to unfold during an afternoon encounter at her home. While her husband is away, Mina is taken even anally, as her inner longing collides with the irresistible pull of another man.