The Leader of the Gym Training Department at Millennium School. She is a sports-oriented girl who always strives to train. She is also a musclehead who believes that all the problems in the world can be solved with both muscles and exercise. Sumire takes training and exercising very seriously. She has long black hair reaching her legs tied to a ponytail with a purple scrunchie, has violet flowers hairpin on her right bangs and green belted choker. She has purple eyes.