High school girl Risa Koizumi, who is far taller than average, is friends with high school boy Atsushi Otani, who is far shorter than average, and together are known as All Hanshin Kyojin. Koizumi develops a crush on Ryoji Suzuki. Otani says he will help Koizumi begin a relationship with Suzuki if Koizumi helps him begin a relationship with her friend Chiharu Tanaka. Otani and Koizumi invite Suzuki and Chiharu to the pool along with their other friends Nobuko "Nobu" Ishihara and Heikichi Nakao who are already dating. Otani and Koizumi accidentally spend more time with each other than with their crushes and Suzuki and Chiharu end up developing crushes on each other and begin dating. Otani and Koizumi console each other and attend a summer festival where they challenge each other to find love before the other does.