Sumiyoshi Nana

Shigure's childhood friend and the treasurer of gojoken. She is popular with the boys due to her "cute, tiny and child-like" appearance, but Nana herself hates being treated like a child, and yearns to be a fine adult. Contrary to her appearance and for the fact she refers to herself in third person, Nana is mature but also very blunt, especially towards Misaki whom she thinks is getting too close with Shigure. She is also bad at cooking.

Shizuku's best friend and classmate. Due to being childhood friends, Nana has known Shigure for a long time and often hangs out with him, but despite this, they seem more like a brother and sister having fun together rather than a couple.