Gamo-chan is a high school student and Nagatoro's best friend. She is a confident, popular, driven, and aggressive girl, serving as the ringleader of the 'cool kids' clique, which includes Yoshi, Sakura, and Nagatoro. Gamo-chan and Nagatoro share a friendly rivalry, and being the first to notice Nagatoro's feelings for Senpai, she enjoys teasing him and pulling unique pranks to help their relationship.