The 2nd arc of the Re:Zero kara Hajimeru Isekai Seikatsu manga. 
Using his ability to repeat past events, a power named "Return by Death," Subaru has saved the half-elf girl Emilia from a grim fate. However, his celebration is violently cut short. Subaru now wakes up in a large mansion, unsure of whether time has moved forward. Greeting him are the maid sisters Ram and Rem, whose verbal jabs sting with every word. It's a chance for a new life, but is Subaru in more danger than he realizes? 
(Source: Yen Press) 
Note: Chapter count includes 20 main chapters, a prologue, and 10 extras.

Subaru Natsuki was just trying to get to the convenience store but wound up summoned to another world. He encounters the usual things--life-threatening situations, silver haired beauties, cat fairies--you know, normal stuff. All that would be bad enough, but he's also gained the most inconvenient magical ability of all--time travel, but he's got to die to use it. How do you repay someone who saved your life when all you can do is die? 
 
(Source: Yen Press)

The 3rd arc of the Re:Zero kara Hajimeru Isekai Seikatsu manga. 
 
Having survived both his encounter with the demon beasts and the nigh endless week at Roswaal Manor, Subaru returns to the capital of Lugunica with Emilia and Rem. Reuniting with friends and foes alike in the city where it all began, Subaru also lays eyes on the other candidates for queen--Emilia's rivals! Can Emilia win against such formidable opponents? And how will Subaru react when he discovers the shocking identity of the final candidate? 
 
(Source: Yen Press)
 
Includes 2 side stories.

When a demon falls for an angel...
 
Long ago, a great war raged between the royal military forces of Lugnica and the demi-humans. A hero was born on that battlefield--the Sword Demon, Wilhelm Trias. This is the story of that legendary swordsman--and the woman he loved.
 
Note: Includes 1 extra chapter.

In the story, Subaru Natsuki is an ordinary high school student who is lost in an alternate world, where he is rescued by a beautiful, silver-haired girl. He stays near her to return the favor, but the destiny she is burdened with is more than Subaru can imagine. Enemies attack one by one, and both of them are killed. He then finds out he has the power to rewind death, back to the time he first came to this world. But only he remembers what has happened since. 
 
(Source: Anime News Network)
 
Notes: 
- The first episode aired with a runtime of ~50 minutes as opposed to the standard 25 minute long episode. 
- In the Winter 2020 season, Re:ZERO was rebroadcast and re-edited to fit into an hour time-slot. This edit included the first OVA and added slight modifications to certain scenes throughout. It also added an additional scene at the end of the final episode.

An anthology comic of Re:Zero kara Hajimeru Isekai Seikatsu by various mangaka. 

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