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