Takao, who lives with his wife Yurina, his father-in-law, and his mother-in-law Rena, has a secret: erectile dysfunction. Yurina lets it slip out of a conversation and the whole family finds out... Yurina asks Rena for advice, "Maybe if mom seduces him, he'll get better?" Rena approaches Takao for her daughter's sake, but she has no idea about the obscene feelings he has been hiding...