Kazuya has angered his wife due to their quarrel. - When I was worried about my wife who had gone back to her parents' house in a fit of anger, my wife's older sister Naoko came to me for advice. - Kazuya, who was really at a loss because he couldn't find a way to solve the problem, completely gave in to the beautiful and caring Naoko. - However, Naoko's real purpose is not to settle the quarrel between the couple, but to relieve her frustration with Kazuya...