Kakio Hazuki (柿生 葉月, Kakio Hazuki) is the cosplayer assistant of Mouse in the series.

Hazuki is Mouse's short green-haired assistant and martial arts expert of the team, while posing as Yamanoue's physical education instructor. There are several personalities within her, from a mischievous child to a brave fighter. When Hazuki foolishly tested a memory-erasing machine and her many personalities were programmed into its computer, Sorata went online to save her. She’s also Zach’s mom.