Schrodinger Narumi

Schrodinger Narumi (鳴海 シュレディンガー Shuredingā Narumi) is the older sister of Nakuru Narumi who only appears in the manga series. She has been shown to be very protective of her younger sister and excels in sports. After hearing about him dating her sister she challenges Kinjirō to a series of events during the sports festival. The real goal, however, was to get Nakuru to fight in Kinjirō's place in order for her to become a stronger person. As the series goes on Kinjirō and Narumi become good friends, with her giving him much needed advice. Narumi is short for her age and small busted which results in her teasing Kinjirō for being into Loli types of girls.