Nanako falls into the sexual trap of her brother-in-law who is staying at her husband's house. He secretly films her masturbating, and then he forces her to give him a blowjob while he sleeps, making her moan in ecstasy. Furthermore, during a family meal, Nanako is teased with a remote vibrator, and she holds her breath so her husband doesn't find out. Her brother-in-law escalates and invites his friends over to have them rape Nanako.
