Having an affair with her husband's best friend, Yuka Arai. Miho and Yuto are living a happy life after moving into the house they had worked hard to buy. One day, Shingo, a childhood friend of Yuto, suddenly comes to visit. He says that the company he works for has gone bankrupt, and at night he was evicted from the company housing without any notice to prepare for it. Kind-hearted Yuto agrees to help Shingo, asking Miho's opinion about letting Shingo stay for a few days. And this is what leads to Miho's sexual infidelity.
