Kusabana Ryouta is a normal highschool boy, except that he always wears a full body dog suit and never takes it off.
Things were just like always until he accidentally drops the bag of the girl he likes, and her sports pants fall out. And just when he picked them up - wondering how they smelled -, the new homeroom Teacher Kizawa Ayame AKA Ayane-Chan catches him in the act. Pleading that he will do anything if she doesn't tell anyone about this, she agrees, but asks him: "In exchange will you let me sniffle your body?".