Risa Koizumi is not your average Japanese high school student, her height is well above that of most Japanese girls her age (around five foot, seven); ironically, her name means ‘little spring’. Risa can be impulsive and strong-willed at times, and is rarely willing to display her softer side. The team of herself and Otani is known throughout the school as ‘All Hanshin-Kyojin’. She had a crush on Suzuki before he started dating Chiharu.
Risa starts developing feelings for Otani and soon admits to herself that she likes him. She then starts trying to confess. Failing the first time, Nobuko and Nakao try to help, Nobuko often giving Risa advice on what to do. Finally she very directly tells him. She immediately says she regrets it, and tells Otani to pretend it never happened, but her true feelings come out, and tells Otani once again, that she likes him. Otani responded that he couldn’t see her as a girlfriend yet, so her new goal is to make Otani regret that and make him like her as well.