Kumi Katayama: A math teacher at Kokatsu Academy and also the homeroom Instructor of course 2-C. Currently being set up by Kei Akashi for employing violence at college, she is suspended from her do the job and has a mental breakdown. Atsushi Takayama: Goal from Yumi Shiina's Synergy tales. https://www.youtube.com/watch?v=ILKyE5vBc8A