It was exactly one year ago that our lives living in the same apartment building were completely ruined. The married woman who moved in, Mrs. Tachibana, took each of our virginities at different times, conquering our bodies and hearts. While maintaining our relationships with her, we each secretly competed thinking we were the most suitable for her. But one day she suddenly said, "I'm going to my husband who's on an overseas business trip"!? Desperate to stop her, we clung to Mrs. Tachibana crying "We'll do anything you say!" But that was the beginning of a huge mistake…