Kakeru Ryuuen (龍園 翔, Ryūen Kakeru) Voiced by: Masaaki Mizunaka[3] (Japanese); Eric Vale[9] (English) He is depicted as the antagonist of the series, and a student under Class C who has a reputation of being a feared delinquent, where he rules the class like a mafia boss, and has a group of henchmen who does his dirty work. Mio Ibuki (伊吹 澪, Ibuki Mio) Voiced by: Mikako Komatsu[3] (Japanese); Jamie Marchi[10] (English) She is a student under Class C who despise Ryūen's dirty reputation as an infamous delinquent. Not only does she possess excellent academic ability, but her physical ability is also not to be underestimated.