START-026 An inappropriate physical relationship began after being confessed to by her best friend. A double affair ignited, and the pleasure of their first intimate encounter was so intense that they spent several days in a secret cohabitation filled with betrayal and passion. Tozuka Ruu

Ken and Mai, and Ruu and Jun, are two couples who get along well. One day when Mai is away, Ken and Ruu are drinking together, and an intoxicated Ruu suddenly confesses to Ken that she has actually liked him all along. Ken is confused, but swept up by Ruu’s momentum, he ends up becoming physically involved with her. Then, during the few days that Mai is away, a brief cohabitation begins between Ken and Ruu.