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; 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.