Ryo married Eri, the daughter of the Ogawa family, and became her adopted son-in-law, living with them. He feels uncomfortable being a house husband in place of Eri, who works. His mother-in-law, Shizuku, witnesses him struggling to have a proper night's sleep. Shizuku tells Ryo, "If there's anything I can do for you, please let me know," and lets Ryo touch her body. Ryo becomes excited...