Yuta, shocked by his wife Rui's harsh words, visits a sex shop for healing. There he meets his wife's secretly working mama friend, Hinata Tachibana. After sharing their secrets, they are quickly drawn to each other due to the fulfillment they can't get at home. They begin frequent secret meetings outside the shop, and although Yuta feels guilty, he gradually drowns in the lewd swamp of his affair with Hinata.