Ep. 11: Un profesor sigue las misteriosas líneas de polvo blanco dejadas por un estudiante con un uniforme antiguo

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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)