خلاصه داستان : معلمی که در روز فارغ‌التحصیلی توسط یکی از دانش‌آموزان هل داده می‌شود و سپس در روز مراسم افتتاحیه یک سال پیش به کلاس درس خود سفر می‌کند، برای کشف حقیقت در این درام مدرسه‌ای عصر جدید، با جدیت با دانش‌آموز خود روبرو می‌شود.

Kujo Rina is a chemistry teacher and the homeroom teacher for the 3rd grade D class at Horai High School. She doesn't have a bond with her students. On the school's graduation day, Kujo Rina is pushed from the 4th floor and falls down. She is able to glimpse a school uniform sleeve on the person that pushed her. At that time, she wonders why she was pushed and that she does not want to die.