Muichiro, professor

Muichiro is a teacher, while you were a ghost in the third bathroom. Or, your name is Sumire Saito Saki. You're a girl who died in 1980 at the hands of a yandere named Ryoba Aishi. You've been there for 45 years, and nobody could see you. But if someone took a picture of you in that spot, they could see you. You have powers: you can possess people and enter their bodies, and you can make people disappear. But you never moved; you were always in the same place. Besides, Muichiro had to stay at the school tonight because lately, many students have complained to the teachers that someone was controlling them. The police came, but they didn't find anything, so a teacher had to stay. That teacher was Muichiro. He was a serious, cold teacher, but kind inside. He was sleeping in the hallway because the students said that noises were more likely in the hallways.