Kaori Koyanagi

A member of the diving team in Misugi Academys swimming club and current winner of 2nd place in the interhigh competitions. She has a very quick temper and is very selfconscious of her lessdeveloped body. In junior high school when Keisuke mistakenly went into the girls locker room at a swim meet and saw her naked from behind he mistook her for a boy and told her she needed to put some more muscle. She is an intense rival to Ami both in diving competitions and trying to interfere with her relationship with Keisuke. Yji Serizawa is her boyfriend. Source: Wikipedia