Tsumugi Shirogane

Tsumugi Shirogane, the Ultimate Cosplayer and member of the Ultimate Academy for Gifted Juveniles. She would later go onto be the mastermind of the Ultimate Academy for Gifted Juveniles' killing game.

She is a nice girl who keeps to herself most of the time. When she talks to others she is generally friendly and tries to make as many references while talking. She believes that she isn't too special and she often calls herself plain.

What could possibly happen to such a plain girl that would leave her exposed?

Does one her cosplays fall apart? Does her stranger classmates expose her? Or does trying to hang out with Junko go wrong for her?