Okuyama is going to his classmate Yuichi's house for the first time. He casually steps over to Yuichi's doorstep, but he can't believe his eyes when he sees something there! When he opens the front door, he sees some sanitary products lying around. Yuichi's mother, Yukiko, greets him without a bra. Okumura is a little taken aback by this unusual family environment, but then he sees Yukiko openly masturbating and realizes everything. "Yuichi's mother has a strange idea of chastity."