Shota, who lives in an apartment complex, has recently been feeling a strange throbbing in his crotch. In the midst of these frustrating days, Yui, an aspiring gravure idol, moves into the apartment next door. Intrigued by Yui No big butt, Shota uses every trick in the book to play pranks on her. His friend Taro joins in, and Yui No sexual desire is on the verge of exploding in the face of the boys' relentless butt-playing!