Hikari, a young tutor with a perfect body. Her big breasts made it impossible for Hiroshi to concentrate on his studies. Knowing that the student was tired of his breasts, Hikari immediately helped him satisfy his sexual desire so that Hiroshi could focus more on his studies. But the girl couldn't have sex, so Hikari helped him by blowing a trumpet. By chance, Hiroshi's father found out about everything. He tried to talk to her seriously, but Hikari seduced him against him. Because his wife had been dead for a long time, when he was seduced by such a beautiful young girl, he couldn't resist. Not only stopping at his father, Hikari even seduced Hiroshi's brother, and eventually took Hiroshi's new son's life. Ever since Hikari had sex with the whole family, Hiroshi's grades were better, his brother was working harder, and his father was finally enjoying the feeling of happiness that he hadn't had for a long time...