While his wife was away on a two-day trip with a friend, Akira was enjoying his life alone. Suddenly, his wife's sister, Reira, came to visit. However, things hadn't been going well with her husband recently, and Reira had been planning to use Akira to relieve her pent-up sexual desire. Unaware of this, Akira let his guard down after eating her home-cooked meal and went to take a bath. Then, for some reason, Reira came in as well...