Rui Nanakawa  

, 七河 瑠依

Rui Nanakawa is Tadashi's older sister by several seconds and has a mischievous personality despite being identical twins. She differs significantly from her brother due to her obsession with collecting anime, figurines, manga, video games, among other things, which makes her an archetypal otaku. Rui attends Hibiki Academy, located near Kirameki Academy, famous for its green uniform blazers.