The main character, Kotaro, and the heroine, Rina, are lovers who they began dating when they entered school.They were close friends with their best friend Kazu, who were in the same class, and their girlfriend Mayu and others, and the four of them often acted together.After the test, the four of us went to town to play, and on our way home we stopped by our house and chatted happily.It was quite common, but perhaps after the test it felt like a sense of freedom, and the erotic story that he had started jokingly tumbled in an unexpected direction. "Do you care about how other people are doing?" The erotic show started with that one word. The appearance of the friends I usually play with is something I wouldn't be able to see.They are secret acts they have shown. A variety of emotions such as shame, jealousy, and ecstasy, and the first excitement I feel...