Wakasa, Yuuri

若狭悠里

Yuuri serves as the president of the School Life Club. She maintains detailed records of food, electricity, lessons, and other resources and activities. Yuuri is typically very calm and mature, behaving in a composed and proper manner. She is also quite serious, always looking after her comrades, and is not afraid to scold someone when they put themselves in danger pointlessly.
In the manga:
[spoiler]When the girls leave the school, Yuuri demands they stop by a local elementary school, wanting to look for her younger sister, Ruu. She eventually finds her and brings her back to the group.

Spoiler