The story of how I ended up letting Daisuke, a seven-year-younger junior who came from a rural area of Niigata to take exams in Tokyo, stay at my house for about a week. One day, I left work early and returned home, only to discover my wife and Daisuke in the midst of a sexual encounter. Trembling with rage, I confronted my wife and demanded a full explanation about everything that had happened. As she revealed the details, I learned that the situation was far more complicated than I ever imagined.