Re:Zero kara Hajimeru Isekai Seikatsu (Re: Life in Different world from zero) or simply ReZero revolves around the story of a NEET named Subaru who one day is suddenly teleported to a fantasy world. Instead of freaking out, Subaru immediately accepts the new reality and decides to live a very comfortable life in the new world. While he is gathering more information about this new world, he runs into some thugs but is saved by a silver haired girl who introduces herself as Satella. Satella stopped to help him even though she was running after a thief who stole her valuable insignia. To return the favor, Subaru decides to help her to find her stolen item. Eventually, they find the thief's hideout and decide to visit her loothouse during night-time. Unfortunately for them, everyone in loothouse is slaughtered and before both of them could grasp the situation, they too end up dead.
Subaru soon finds himself standing in the city again, being cornered by the thugs again and watching the same things happen as he soon realizes that he returns to past each time he dies.