Kyoka, a housewife in her fourth year of marriage, was living a peaceful life while waiting for her husband Yosuke's raise. However, Yosuke's unilateral decision to prioritize deliveries to a client at work caused a problem, and his promotion was in jeopardy. In exchange for maintaining the business, her boss, Sagawa, asks Kyoka to have sex with him "just once," but this triggers Kyoka to fall into the swamp of deep carnal desire.
