Eita Ishibashi is a perverted boy inherited from his father. The world of sexual knowledge that Eita talks about stimulates his best friend Mamoru's instincts and attracts him. Erotic book shown when Eita came to stay. On the other hand, when I went to stay at Eita's house, I saw the work of Yuta and Riko as a married couple, an unknown world of culture shock. Miharu Hoshino, a new female teacher and homeroom teacher, falls prey to the pranks of boys who are curious about sex. Eita's naughty mischief... Miharu, who has no experience with men, was dyed.