The story follows Risa, a girl with zero experience in romance. Meanwhile, a boy named Yuugure is the most popular student in Risa's school year. Even though the two have had no contact with each other in the past, they find themselves at school at the same time one night.

Tsubomi Tachibana is a fifth grader dealing with rather sensitive issues such as her mother's pregnancy, her first period and the strange feelings she has started to get when she has been around boys.

Tsuwabuki is a normal student, though not very social. One day he meets a new transfer student, named Sumomo Akihime, and another girl, both the only members of the gardening club. Tsuwabuki is forced by a teacher to join this club. But then he bumps into a strange guy with dog ears, switching his drink with they guy's by mistake. Drinking it, he is turned in a stuffed animal. The teacher tells him that the only way to turn back to normal is to find the chosen girl and let her catch the seven stardrops. This girl is Sumomo, that accepts to help him, though she's not allowed to know the animal's true identity.

Harada Kusuko is a high school girl with a secret crush on the class playboy, Mishima Takeshi. After breaking up with his most recent girlfriend, Mishima asks Kusuko to be his date for the class trip to Kyoto. She's over the moon, but in fact, Mishima is hung up on Shouko, his middle school teacher. Despite the age gap (and general inappropriateness of the relationship), Mishima still sees Shouko, whose marriage is disintegrating. His friend and loyal wingman, Kotaro, openly disapproves of this connection. As the emotional tensions mount, Mishima becomes involved in fights with other boys, and eventually, he's expelled from school. Feeling like he's been a complete jerk, Mishima breaks up with Kusuko and drops out of her life. Will true love find a way?