Web Novel

Re:Zero kara Hajimeru Isekai Seikatsu originally began as a web novel on Shousetsuka ni Narou, with the first chapter being released on April 20, 2012. Since then, the author has used it as a draft for the upcoming light novels and releases chapters occasionally whenever he has time to continue it. As the web novel is a draft, everything up to the latest light novel release in the web novel is now non canon.

Arc 1: Chaotic First Day
Chaotic First Day (怒涛の一日目) is the first arc of the web novel. The first chapter was released on April 20, 2012, and finished on the May 8, 2012, with the arc consisting of a prologue, 22 chapters, and an interval.

The first arc is about Natsuki Subaru's arrival in the new, mysterious world he has been summoned to. There, in the Kingdom of Lugnica, he decided to help a silver-haired, amethyst-eyed girl with recovering her stolen insignia. However, he ends up being murdered by someone, but Returns from his death, and decides to use this ability to save that girl from her predestined death.

Arc 2: The Tumultuous Week
The Tumultuous Week (激動の一週間) is the second arc of the web novel. The first chapter was released on May 9, 2012, and finished on the July 8, 2012, with the arc consisting of 49 chapters and an interval.

This second arc is about Subaru accommodation in the Roswaal's Mansion, where he started working as a butler with Ram and Rem, but nevertheless, in his first days of working, he was mysteriously murdered. Willing to discover the killer, Subaru will do everything possible to gain the trust of everyone at the mansion and achieve the desired outcome; saving himself and everyone he cares about.

Arc 3: Return to the Capital
Return to the Capital (再来の王都) is the third arc of the web novel. The first chapter was released on July 16, 2012, and finished on the April 19, 2013, with the arc consisting of 84 chapters, 3 intervals, and 2 extra chapters.

The third arc is about Subaru, who after embarrassing Emilia in the Royal Capital, is left to be treated by Crusch Karsten. Soon after, Subaru and Rem return to the mansion, only to discover that everyone of the Emilia Camp was brutally murdered by a mysterious Witch Cult. While repeatedly dying and Returning, Subaru encounters new opponents and obstacles, finds clues, and discovers that in order to push through this seemingly unending nightmare, he'll have to ask for help.

Arc 4: The Everlasting Contract
The Everlasting Contract (永遠の契約) is the fourth arc of the web novel. The first chapter was released on April 20, 2013, and finished on the August 3, 2014, with the arc consisting of 135 chapters, 4 intervals, and 3 extra chapters.

The fourth arc is about Subaru and Emilia arriving at the Sanctuary, where they encounter Roswaal, Ram and the missing Arlam Villages held hostage by a mysterious and aggressive boy. Roswaal instructs the two of them to carry out the Trials of the Sanctuary, in order to liberate the Sanctuary and save the Demi-Humans trapped in it by a mysterious barrier. However, the journey starts to get complicated as Subaru's only weapon; using his Return by Death to gain insight on how to bypass the obstacles, proves ineffective.

Arc 5: The Stars That Engrave History
The Stars That Engrave History (歴史を刻む星々, Reikishi wo Kizamu Hoshiboshi) is the fifth arc of the web novel. The first chapter was released on September 17, 2014, and finished on the August 13, 2015, with the arc consisting of 81 chapters, 3 intervals, and 3 extra chapters.

The fifth arc is about Anastasia inviting the Emilia, Crusch, Priscilla, and Felt Camps to attend a gathering in Watergate City of Priestella. Soon after their arrival at the Watergate City, the Witch Cult appears, taking control of the city and forcing Subaru to unite all camps in order to defeat the evil Cultists and liberate the city.

Arc 6: The Corridor of Memories
The Corridor of Memories (記憶の回廊, Kioku no Kairou) is the sixth arc of the web novel. The first chapter was released on August 15, 2015 and the arc is currently ongoing. Currently, the arc consists of 89 chapters and 7 extra chapters.

The sixth arc is about Subaru who leads a team to the Pleiades Watchtower to gain knowledge regarding how to fix the problems caused during the battle in Priestella. Once they finally arrive after much trouble, the Tower's gatekeeper Shaula tells them that to gain knowledge, is to complete the trials corresponding to the floor. However, in the process of doing so, old enemies reappear alongside some new faces who should not have been in the tower.

Re:Zero IF
The Re:Zero IF chapters are web novel chapters posted each April Fools'. To celebrate Natsuki Subaru's birthday, the author writes a chapter or chapters which deviate from the original web novel. They are around four times longer than normal chapters and show what would've happened if Subaru did something contrary from what he actually did. Each of the chapters resembles one of the seven deadly sins.

Trivia

 * Currently, only one Web Novel chapter has been removed from the Web Novel, which is the Butterfly's Dream What IF Story.
 * According to the author, there will be eleven arcs, though he originally planned for ten.
 * The Web Novel does not feature any illustrations except for the End of Sloth chapter in arc 3 (chapter 80).