Natsuki Subaru is summoned to a parallel world on his way home from the convenience store. He's entranced at first, but the cute girl he believes summoned him is nowhere to be found, and soon enough he's utterly lost.

After being attacked, sliced open by Elsa, and stabbed in the back by punks, Subaru should have been dead. Instead, he found himself back where he started in the same parallel world every time.

Subaru now lives in Roswaal's mansion, working with Ram and Rem, and finally getting Emilia to agree to a date with him. But the day of their promised date never comes as Subaru keeps going back to the day he first awoke in the mansion.