Natsuki Subaru, an ordinary high school student, is on his way home from the convenience store when he finds himself transported to another world. As he's lost and confused in a new world where he doesn't even know left from right, the only person to reach out to him was a beautiful girl with silver hair. Determined to repay her somehow for saving him from his own despair, Subaru agrees to help the girl find something she's looking for.
Amid dying countless times, Subaru finally led the troops to victory against the White Whale and struck down the schemes of the Sin Archbishop of Sloth. After overcoming a painful ending to his these ordeals, he was reunited at last with his beloved Emilia… only to learn that Rem’s existence had been erased from the world, wiped out by the White Whale somewhere in the middle of his death loop. And now that the White Whale is defeated, Subaru and the others face a crisis no one could have expected.
After concluding their talks with Crusch, Subaru and Emilia return to the village of Arlam, intending to report to Roswaal and discuss what to do next. But they find Arlam deserted and learn that the villagers who had taken refuge in the Sanctuary with Ram have not yet returned. When Subaru and Emilia arrive back at Roswaal’s mansion to find out where the Sanctuary is, they are greeted by Frederica, a young woman who used to work as one of Roswaal’s maids.
On the way to the Sanctuary, Subaru unwittingly finds himself invited to a witch’s tea party, where the hostess introduces herself as Echidna, the Witch of Greed. Subaru is alarmed, but Echidna encourages him to sit and drink his tea before it gets cold. When he somehow makes it back outside after a conversation with Echidna, he finds Otto lying on the ground, battered and beaten. Then, before he even has a moment to assess the situation, Subaru himself is attacked.
It’s supposed to be his own room, a place he’s supposed to be used to seeing, but Subaru can’t shake the feeling that something is off. He’s overcome by an indescribable sense of uneasiness, but being caught in his father Kenichi’s armlock shakes it away. Subaru is stunned, but retaliates with a wrestling move of his own. As the two of them carry on, Subaru’s mother, Nahoko, informs them that she’s hungry and they should all eat breakfast together.
Elsa's attacked Subaru with a deadly blade in Roswar's mansion. Subaru, who has lost his life, wakes up in the graveyard. Immediately after breaking through the first challenge of facing the past, Subaru returns, holding up Emilia, who lays down just as he did when he first awoke. Subaru then tells him that he has overcome the challenge and suggests that he try the remaining challenges on behalf of Emilia, but the offer is opposed by Garfiel.