Husband Ryosuke's declining stamina makes wife Mao hold back, replying with a polite "I'm busy" out of consideration. Yet deep down, she feels unfulfilled and emotionally wounded, unable to feel any attraction. Into their home steps Takumi Murata, Ryosuke's subordinate, who quickly senses the couple's sexless marriage and seizes the opportunity to seduce Mao. Initially resisting, Mao gradually becomes shaken as Murata aggressively and passionately pushes forward, his wild, dominant advances breaking down her resolve.