|Tateyama Sakae館山 栄|
|Hair||Brown, Goatee, Short, Straight, V Bangs|
|Body||Pale, Slim, Young-adult|
|Clothes||Ankle Socks, Belt, Glasses, Lab Coat, Necktie, Shirt, Slippers, Trousers|
|Role||Homeroom Teacher, Student Club Advisor|
|Visual novels||Side character - Hinekuremono no Gakuen Seishun Monogatari ~Ore to Kanojo no Reversible~|
|Voiced by||Abismo Guerrero|
Protagonist Homeroom teacher, who force him to join the "Youth Club" to get used to social with people around him.