Tsuwabuki is an ordinary student, albeit not particularly social. One day, he encounters a new transfer student named Sumomo Akihime and another girl, who are the sole members of the gardening club. A teacher forces Tsuwabuki to join this club. However, he then collides with a strange man with dog ears, accidentally swapping his drink with the man's. Upon drinking it, he is transformed into a stuffed animal. The teacher informs him that the only way to return to normal is to find the chosen girl and allow her to catch the seven stardrops. This girl is Sumomo, who agrees to help him, although she is not permitted to know the animal's true identity.