Kumi Katayama: A math teacher at Kokatsu Academy along with the homeroom Trainer of class 2-C. Staying setup by Kei Akashi for applying violence at school, she is suspended from her do the job and has a mental breakdown. Atsushi Takayama: Focus on from Yumi Shiina's Synergy stories. A https://www.youtube.com/watch?v=ILKyE5vBc8A