Synopsis

The story kicks off when Kujou Rina (Matsuoka Mayu), a chemistry teacher and homeroom teacher for Class 3D, is pushed from the 4th floor by one of her 30 students on the day of the graduation ceremony. However, when she regains consciousness, she finds herself one year in the past before the incident had occurred. In order to change her fate, she decides to face the class once more to figure out the culprit behind her murder.