Mio Itai is Satsuki's friend and classmate that appeared in The Corpse that Roams in the Night – Shirotabi. She is a shy girl that loved her bunny, Shirotabi. Shirotabi died, and Mio became very sad. So, she made a spell in order to make Shirotabi come back to life, however, Shirotabi came in the form of a monster. In the end, Satsuki and her friends managed to exorcise Shirotabi, and, despite Mio being sad, she was somewhat happy as now her friend could rest in peace. She also likes to make animal dolls, and even gave one to Satsuki.