Mei, the younger sister, was frustrated every day by the sounds of the AV that she heard from her brother's room. One day, Mei reunites with her childhood friend Mamoru. She is Mamoru who is attracted to Mei who has grown up like an adult. The distance between the two is shortened at once by the sound of the AV that was heard from the brother's room next to her. Mei, who was frustrated by the sound of her brother's AV, felt violently about her first sex with her childhood friend.
