Secretory of Aboveground Student Council.
( Prison School )
Mitsuko is a beautiful, slim and short girl with dark green hair that is tied in twin buns with bangs swept to the left side and emerald eyes.

She is seen wearing the standard school uniform, without a tie and sometimes dresses with an open collar and without the blazer when doing manual labor for the official Aboveground Student Council. She is often inadvertently seen with her skirt stuck inside her underwear. 