Ayato is a vocational student with a specific problem: he's highly sensitive to smells. One day, on the train, he encounters a particulary alluring scent that makes his body react. The scent belonged to his classmate Rio, whom he is not very fond of! Rio, amused by Ayato's predicament, starts to force Ayato to do all kinds of naughty things, but what changes when he finds out about Ayato's innate kindness and hardworking qualities...?
