Takuya Aihara, an average junior college student with one character flaw: He's a bit of a weakling. No matter how hard he tries, it seems that all the girls around him are constantly pushing him around: His teasing step-sister Natsumi, the genius president of his chemistry club Mami, but especially Asuka, his beautiful childhood friend. No matter how hard he tries, he just can't assert himself.
One fateful day, while cleaning some shelves in the chemistry room, he spill a mysterious chemical on yourself. The next thing you know, he's been transformed into a girl! And so begins this hilarious erotic adventure in which poor Takuya gets some very interesting lessons in anatomy and sex education!
As a woman, Takuya discovers a new world of experiences, some welcome and others not. Can Takuya find a way back to normal, while avoiding the many temptations that come with his new female body? Can he find a way to express his feelings for Asuka, without hurting another who loves him?