"Akari" is a top class honors student who is planning to go on to a famous university. During this winter vacation, I visit an empty school to receive individual lessons from my teacher, Oshima. However, when he arrived at the staff room, Oshima asked him to do something. It was a request to teach study to the withdrawal student "Zuo Ci" in the same class. While wondering, Akari heads to the designated place in the school, but... Falling into the trap of the devil teacher and the scum, the inescapable circle hell and mind control. #Yoro P