Des：Yuji and his wife return to their wifes parents home. Her mother-in-law, Yuu, who greeted her, was her father-in-laws second wife and was young and beautiful. Yuuji was concerned about the strained relationship between his mother-in-law and his wife, but when his wife heard about it, she lost her temper. That night, when Yuuji went to the kitchen, he found Yuu having dinner alone. There, Yuuji hears about the relationship between his wife and mother-in-law. The two gradually get excited as they talk about their night life, and end up getting drunk and crossing the line. After that, the two end up touching each other...