第 11 集: 一名教師追蹤一名穿著舊制服的學生留下的神秘白色粉末線索

11

A new teacher is staying after school grading tests for her class. When she glances out the window, she sees a student in an unfamiliar, old-looking school uniform, laying white powder lines in the schoolyard. The teacher steps outside to issue a warning, but the student is gone, and the white line continues into the school building. So she follows it inside to find the student... (Source: Crunchyroll)