After a fight with his wife, she returned to her parents' home. Kouichi was spending time alone when his sister-in-law, Nao, visited him. Gratefully accepting her offer of reconciliation advice, he let her in. However, Nao's true intention was Kouichi's body. Taking advantage of his wife's absence, she repeatedly teased him with provocative poses and even barged into the bathroom while he was bathing, offering to wash his back. Kouichi, though verbally rejecting her advances, couldn't hide his physical response from Nao…
