Amaenaideyo!! Katsu!!

Deep in the mountains, isolated from civilization, there is a boys-only school that will finally be receiving its first class of girls in an attempt to transform the school into a co-ed one. Most of the boys have never been in contact with girls of their own age, leading to an explosion of hormonal craziness. From the sickeningly perverted fetishist guys, to a rather odd girl that seems to be chasing the most normal guy in the school for reasons known only to her, there's twisted humor to be had.

When they were young, Kazuki and her older sister Hatsune had Yuuji and his little sister Marie as next door neighbors; and while Kazuki developed a crush Yuuji, he and his family moved away for ten years, much to her dismay. Now, the duo is finally returning, and Kazuki eagerly awaits his arrival; she still has a crush on him, and wants to finally confess her love to the handsome and debonair man that Kazuki has become – or has he? Unfortunately for Kazuki, Yuuji has “evolved” into a typical teenage pervert who can’t keep his hands off her. Family isn’t much help, as Hatsune helps Yuuji at every chance she can get, while Marie and her air gun are ready to lay down the law at a moment’s notice. With hormones raging and hands groping, will Kazuki retain her feelings for Yuuji?