Rika moved to a town due to her husband's work. She was told that she should say hello to Mitsuko if she wanted to survive in the town, so she went to visit her. When they first met, Mitsuko asked Rika if they had sex. Rika was confused, but Mitsuko said, "I'll show you since you've come all this way," and brought her to a room where Rika saw Mitsuko and a mysterious young man named Haruto having sex...