Spring. What was supposed to be the beginning of an exciting university life began with a big butt attracting trouble!? On his first day living in the dorms, Amamiya is groped by a pervert on the train, and is rescued by a strong hand. But the moment that hand unexpectedly touches his butt, he moans sweetly......!? Shocked, Amamiya runs away without thanking them. "I have to forget about it......" As he thinks this, the person he sees again at the dorm is......! "To think I want to touch a man's butt......" "I'm a man, yet I get aroused when my butt is touched......" One man with a butt fetish awakened by the luxurious feel, and another with unwavering insecurity about said butt!! Who's to blame for their confusing feelings?