False sisters (reprinted special price edition)

E continued to have an affair with Keisuke, a colleague of the company. However, the plan to go on a hot spring trip suddenly canceled. On his way home from the company, Ei felt that he was being given to an unknown old man. E has a relationship with her older sister's husband, Tomohiro. It was like a revenge from the jealousy of his happy sister. And one day, E realized the identity of an older man, and was amazed to know that it was important for his sister and his past.