Takao lives with his wife Yurina, his father-in-law, and his mother-in-law Rena, hiding a secret—ED. When Yurina accidentally mentions it in conversation, the family discovers his condition. Believing he might be cured if seduced by her mother, Yurina confides in Rena. Wanting her daughter's happiness, Rena begins approaching Takao, unaware of the hidden emotions he harbors. As tangled feelings weave through the family, the raw truth of their household comes to light.