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 attempts to buy the insignia from Felt and return it to Satella before Elsa arrives at the loot house, but Satella arrives before the negotiations are complete and Elsa still attacks them.

After being badly wounded by Elsa, Subaru somehow survived and awoke in the mansion of Margrave Mathers, in the Kingdom of Lugunica.

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.

Subaru's first day at the Roswaal mansion begins again. First he grew weak and died in his sleep, and then he was killed by an unknown attacker. The sound of chains from his second death replays in his mind, waking him in a terrified, cold sweat.