Koto Ootsuki

Оригінальне ім’я: 大月琴

Eiji's Childhood friend and an acting older-sister. Ootsuki Koto is mischievous and playful, often hanging out around Nanako and Eiji, teasing them every now and then. She often gives Nanako advice whenever Nanako asks for help. She is the president of the "Modern US army combative" club.