The magic Roswaal is using to control the weather generates enough mana to attract the Great Rabbit, which draws closer to the Sanctuary in a massive horde. Emilia takes Roswaal and Ram to shelter in the graveyard with everyone else, but the Great Rabbit horde has already grown enough to engulf their surroundings. Just when all hope seems lost, Subaru and Beatrice appear before Emilia. So begins Subaru and Beatrice's first battle against the Great Rabbit, one of the Three Great Mabeasts.

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.

Subaru desperately tries to fend off the attack from Sin Archbishop Sirius. But then, other Archbishops appear...

Through a Witch's Cultist's conference mirror, Emilia tells Al where the Sin Archbishops are and asks him to protect Beatrice. Al relays Emilia's message to Subaru, and the gang begins to devise a strategy to win back the control towers.

After witnessing an unrealized present, Emilia completes the second trial and begins the third and final one. Ram and Puck are fighting their hardest to stop Roswaal. Each of them is doing it all for the sake of realizing their own goals. The battle between Garfiel and Elsa at Roswaal’s mansion is also growing more and more intense. As Subaru is being chased by a guiltylowe, he declares that it’s time to make use of his unparalleled knowledge of the modern world and lures it into a closet…

Subaru and the others hold a meeting in the city hall to develop a strategy against the four Sin Archbishops. However, Emilia is slowly running out of time...

Capella uses Al's admiration for Priscilla against him, and Garfiel fights the legendary "Eight-Arms" Kurgan.

Subaru was caught and confined by Garfiel, but Otto shows up to rescue him. Garfiel can’t leave the graveyard while Emilia is undergoing the trial, so Otto says this is their chance to get outside the barrier, but Subaru doesn’t agree. However, after he learns that Ram will be helping them—that she has been ordered by Roswaal to help him, in fact—Subaru puts his escape on hold to have a talk with Roswaal.

Subaru awakens in the graveyard with Emilia lying nearby. This time, he makes up his mind to save not only Emilia, but everyone in the Sanctuary and Roswaal’s mansion from the threats that hang over them. Roswaal makes it clear that he will use Subaru’s power to keep starting over by force if he has to, if it will allow him to achieve his own goal. What is driving Roswaal to go to such lengths? In search of the answer to this and many other questions, Subaru goes to see Echidna once again.

Pandora, the Witch of Vanity, stands before Geuse and Fortuna. They both face her with all the strength they have. Meanwhile, young Emilia runs toward the place where the seal is, believing that everyone will be saved if she gives Pandora what she wants. But when she arrives, Pandora is already there, insisting that she hand over the key to opening the seal.

The attack on the city hall enters its second phase. Subaru and Crusch breach the interior, but there they are awaited by Capella, who has some sneaky tricks up her sleeve...

Bishop Regulus of the Seven Deadly Sins wants to force Emilia to marry him, even though he already has hundreds of wives. While he is having the wedding hall prepared, Subaru and the others are planning to rescue Emilia and reclaim the city...

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.

Having reached a place he can’t return from, Subaru realizes just how much he has been given and how little he can do to repay any of it. After remembering what he must do, he says goodbye to Kenichi and Nahoko and heads to the school. Steeling his resolve, Subaru opens the door to the classroom, where he’s greeted by Echidna in a school uniform. When Echidna says he arrived much sooner than she expected, Subaru responds that she looks good in the uniform.

After dying to Elsa’s blade in Roswaal’s mansion, Subaru awakens back in the graveyard, in the moment immediately after he passed the trial that required him to face his past. Just like the first time he returned there, he wakes Emilia and holds her to comfort her, then returns to Ryuzu and the others. He tells them that he passed the trial himself and suggests that he could complete the remaining stages of the trial in Emilia’s place, but Garfiel is opposed.

The missing Emilia was in the graveyard all along, her lost memories beginning to return due to Puck’s disappearance. Confused and losing heart over the realization that she’s forgotten such important memories, she tries her hardest to convey her feelings to Subaru. When the two of them leave the graveyard, they’re awaited by Garfiel, who’s been battered and beaten by Otto and Ram. He tries to prevent the Sanctuary’s liberation by closing off the graveyard himself, but Subaru won’t let him have his way without a fight.

Despite a few inconveniences, like being unable to go outside when she wanted, young Emilia lived a happy life in a settlement of elves with Fortuna, whom she lovingly called “Mother.” However, their peace was threatened by the arrival of the Sin Archbishop of the Witch’s Cult representing Greed, Regulus Corneas. In the present, Shima appears before Subaru and the others as they wait outside the graveyard for Emilia to complete the trial, and she tells them of the events leading up to the birth of the Sanctuary.

While battling Lye Batenkaitos, Otto discovers the secret to the Sin Archbishop's power.

A year has passed since the battle at the Sanctuary, and Subaru has been spending fulfilling days united with Emilia's camp. However, his peaceful everyday life ends with the arrival of a single letter.

Upon returning to Roswaal’s mansion, Subaru is greeted by an unbelievable sight and wails that this was not what he wanted to happen. Stricken with despair, everything before Subaru starts to go white as, finally, he hears a voice: “You were too late.”

Subaru had reached for the door, determined to save Rem from harm even if his current world would soon end. But instead of Rem, he found himself staring at Beatrice’s library. Beatrice had remained silent throughout Elsa’s attack and saved Subaru’s life just moments before Elsa could claim it. Subaru shouts at Beatrice, demanding to know why she didn’t help before everyone else was killed, and an intense argument ensues. Then Subaru catches sight of a familiar-looking book…

After being eaten alive by a herd of unknown creatures resembling rabbits, Subaru awakens in a half-maddened state next to Emilia in the graveyard. As he pounds his head against the rocky ground over and over in anguish, he finds himself invited once again to a witch’s tea party. There, he tells Echidna about his Return by Death ability, something he has never been able to tell anyone before. Echidna then begins to tell Subaru about the witch who gave him this power and set him on this agonizing path.

As she attempts the first trial, Emilia finds herself in Elior Forest, where she lived when she was younger. Echidna snidely remarks on her audacity to set foot here after so thoroughly disgracing herself before, but Emilia responds with a bold smile and tells her she won’t cave to the malice of a fellow witch. As they proceed deeper into the forest, they come upon a massive tree towering over its surroundings. At its base is a small, barred door, which Emilia identifies as the Princess Room where she was often sent to play as a child.

Subaru tries to prevent the attack on the mansion by talking to Roswaal, but Roswaal refuses to let go of the wish he has clung to for 400 long years. Subaru takes Garfiel and Otto along as he hitches up the carriage to Patrasche and heads for the mansion as quickly as he can. Meanwhile, now that Emilia has completed the first trial, Ram asks her for a favor. Touched by the strength of Ram’s feelings, Emilia reaches out to help her.