Mai Otsuka is one of the two class representatives for Class 2-C, the other being Haruki Hanai. Mai's best friend appears to be Tsumugi Yuuki. She is serious most of the time especially when it comes to her responsibilities as class rep. However, the class does not share that seriousness when she is up there trying to talk. This is after all, Class 2-C with more than its share of delinquents. As shown in the end of the first episode of the second season, she is hiding a sizable bust for some reason.