The Greatest Teacher

On graduation day, a teacher is pushed over a railing. She wakes up to find herself back on the first day of school in a classroom full of suspects.

Rina's husband requests a divorce, but unlike the previous time, she resolves to learn exactly why. Later, two masked figures attempt to mug her.

Rina receives a death threat for the first time. Her students try to find out who did it, but she quickly identifies and confronts the culprits.

Ren has an unexpected reaction to Rina's revelation; Ugumori bonds with her new friends, irritating Nishino; Rina gives a prescient warning to Enami.

Rina appoints the eccentric Mizuna to be in charge of an event at the school festival; she does so to avoid the disaster that befell it the first time.

Kochiya runs off before Ugumori can respond to her sudden confession; Rina and Ugumori discuss their peculiar shared experience.