
Yuna and Akari are two high school girls with very different views on love: Yuna dreams about romance through rose-coloured glasses, while Akari is down-to-earth and practical. Meanwhile, high school boys Kazuomi and Rio also have different views on love: Kazuomi is an airhead who can't grasp the concept of love, while Rio grabs onto any confession as an opportunity—so long as the girl looks cute. Will these four classmates end up leading a youthful romance that meets their expectations?

Fifteen-year-old Sei Saotome is the type of person who tends to fail at the most crucial times. After nearly becoming a high school drop-out, she enrolls into a school that is overambitious for her. There she meets the bold and popular Taiyou Udagawa; and the dreamy and stars obsessed, Mizuki Ootaka. After being asked by Mizuki to join the two guys in the Astronomy Club, it turns out high school life isn't as bad as she had expected.

Ninako, who has an honest and gentle personality, lives her days without yet knowing the feeling of love. One day, she bumps into her classmate Ren on the train on her way home, and gradually becomes drawn to his hidden kindness. Ninako feels a pain, as if something has stabbed her in the chest. Eventually, she realizes that her feelings are "love," and she makes up her mind to tell Ren how she feels.