Коїдзумі Ріса

Risa Koizumi is not your average Japanese high school student. Risa's height is well above that of most Japanese girls her age (the average height for a female is 160 cm (5 ft 3 in) Ironically, her surname means 'little spring'.

She and other characters compare her to a giraffe. Risa can be impulsive and strong-willed at times, and is rarely willing to display her softer side. She had a crush on Suzuki before he started dating Chiharu.