RE ZERO KARA HAJIMERU ISEKAI SEIKATSU

Subaru Natsuki is a hikikomori who does nothing but play games. One night, after visiting a convenience store, he is suddenly summoned to another world. With no sign of who summoned him, he soon befriends a silver-haired half-elf girl who introduces herself as "Satella", and her companion Puck. "Satella" mentions that her insignia was stolen by a thief named Felt. When he and "Satella" are mysteriously killed, Subaru awakens and discover that he has acquired the ability "Return by Death", enabling him to reverse time by dying. He learns that the name "Satella" actually refers to the Jealous Witch, and is considered a taboo. With the help of Reinhard (a knight), Subaru saves "Satella's" life from the assassin Elsa; she reveals that her real name is Emilia, and as a token of gratitude, Felt returns the insignia to her.

While recovering at the margrave Roswaal's mansion, the mage Beatrice drains Subaru's mana. After waking up, he meets the twin maids Ram and Rem, as well as Roswaal, who hires him as a butler. Roswaal reveals that Emilia needed the insignia to qualify as a candidate in the upcoming royal election. After mysteriously dying again, Subaru decides to investigate the circumstances leading to his death, and tries to recreate these events. Following a series of traumatic deaths and revivals, he learns that a curse had been placed on him, then deduces it came from a village he had visited earlier, also resolving Rem's intense hatred for witches. Eventually, the village is threatened by creatures known as mabeasts, so Subaru, Rem and Ram have to rescue the villagers.

Later, Emilia is summoned to the capital by two members of the Royal Guard, Wilhelm and Felix. There, Subaru and company meet the other royal candidates: Priscilla, Crusch, Anastasia and Felt; and their knights, Aldebaran, Julius, and Reinhard. Felt initially announces that she will not participate in the election, and Subaru declares himself to be Emilia's knight. Following a public fight which leaves Subaru badly injured, he gets into a huge argument with Emilia, and she decides to cut ties with Subaru, leaving him behind.

After recovering, Subaru decides to train under Wilhelm, while Felix advices him to make up with Emilia. Rem then warns Subaru that something is occurring at the mansion, and against Crusch and Felix's warning, Subaru decides to return to the mansion. There, he discovers many dead bodies, including that of Rem, much to his horror. After dying and respawning, he is ambushed by a wicked group known as the Witch's Cult and meets the insane leader, Betelgeuse, who then tortures and kills Rem. Having later been killed by a monstrous Puck, Subaru respawns and curses Betelgeuse. Knowing that the mansion and village will be attacked, Subaru seeks help from the other royal candidates, but they all decline. While gathering an evacuation, he encounters a legendary mabeast called the White Whale. Rem sacrifices herself to allow Subaru to escape. After returning to the mansion, Subaru encounters Ram and Emilia, who have no recollection of Rem. Disturbed by the situation, Subaru reveals his "Return by Death" ability to Emilia, only for her to die afterwards. Puck, enraged, transforms and kills Betelgeuse and his cult, then freezes Subaru to death as punishment for Emilia's death. After respawning, Subaru, having fallen into utter despair, has a serious conversation with Rem, asking her to run away with him. Rem, however, strongly encourages Subaru not to give up and confesses her love for him, already knowing that his heart is for Emilia. With newfound resolve, Subaru then decides that he will start again from zero.

Subaru and Rem later battle against the White Whale, after successfully striking an alliance with Crusch's and Anastasia's camps. Following a long and hard fought battle, Wilhelm ultimately kills the White Whale, thus avenging the death of his wife. Eventually, with the help of his new allies, Subaru is finally able to defeat Betelgeuse and his cult, saving the lives of Emilia and the villagers. Having reconciled with Emilia, Subaru confesses his love for her, leading Emilia to tearfully thank Subaru for saving her.