My younger sister Mika and her husband Shun who moved next to the room where my older sister Ryo couple lives. One day, Mika, who saw Ryo bringing her man, consults her husband, Yuichiro. However, Mika is hugged by Yuichiro, who is calm even after listening to her story, and she is played with. After that, Ryo found out about her relationship with Yuichiro because of her casual attitude, and when Shun was seduced just to get her revenge, the sisters and couples began to interact with each other. ….
