Aoi, a promiscuous wife, feels a strange emptiness and loneliness in her love and relationship with her husband. To alleviate her loneliness, she tries a dating app, but instead meets her father-in-law, who had been eyeing her all along. Initially hesitant, they cross the line, and their encounter is then witnessed by her health insurance provider. With her relationship with her father-in-law now a weakness, and her feet and armpits licked by the insurance provider, Aoi ends up with three men...