As punishment for sleeping through an assembly, Risa Koizumi is forced to go to summer school, where she's stuck sitting next to Atsushi Otani, with whom she shares a love/hate relationship. Enter Ryoji Suzuki, the transfer student. It's love at first sight for Risa, and Atsushi agrees to help the two get together in exchange for an introduction to Risa's friend meek friend Chiharu Tanaka, who is especially uncomfortable around boys.
Things seem to be going well for the two prospective couples--until they find out that Chiharu doesn't see Atsushi as a boy, nor does Ryoji see Risa as a girl, due to their heights. Crushed, the two decide to give up and Chiharu and Ryoji begin going out no longer afterward. On top of the school's roof, Risa and Atsushi have come to terms with this and, as their normal, blusterous selves, challenge each other to see who can get a boyfriend or girlfriend first.