Isekai is a genre of manga that has always been warmly welcomed and highly regarded. Readers particularly enjoy the imaginative worlds and the many unexpected elements it brings. However, the isekai genre is quite challenging to master due to the plethora of storylines, and often faces failure due to contrasting perspectives on what the genre truly signifies.
Alongside a number of successful isekai mangas, there are also many titles that had to be shelved due to various other matters upon completion.
Here are some interesting isekai mangas that may never be completed.
1. Another World Nation Archimaira: The Weakest King And His Unparalleled Army – Potentially hindered by the creator’s health issues

Helian is a top player in a VR game building a nation, and when he is reincarnated in that world, he encounters a troop of NPCs that have leveled up. Now, he has no other choice but to conceal his identity and take responsibility for the entire nation he has created. The manga introduces concepts related to nation-building and draws inspiration from Overlord.
Currently, there are only 13 chapters in manga format, as it mainly adapts the story from the Light Novel (LN) series. Unfortunately, the light novel has not received significant recognition from Japanese readers after the third volume, and there have been discussions to abandon the story after the creator’s health began to affect the ability to continue the series.
2. The Killer Of The Reincarnated: Cheat Slayer – The manga was canceled after one chapter

Cheat Slayer follows the main character Lute, who wishes to join a group composed of individuals reincarnated into this world. In addition to battling against the demon lord’s army, this group has also faced various villains, and Lute’s goal is to infiltrate this group.
Unfortunately, the manga faced cancellation by Kadokawa due to its similarities with other famous isekai mangas. The creators received backlash because of this, and they did not like the idea of having their characters blend into other isekai favorites.
3. The Epic Tale Of The Reincarnated Prince Herscherik – Stopped due to a lack of creativity and originality

Once an otaku, Ryouko’s life ended on her birthday, and she was reincarnated as a beautiful princess in a fantasy world. She is now Princess Herscherik, the most beautiful princess in the realm, using knowledge from her previous life to uncover all the dark secrets surrounding her throne.
The manga is illustrated by a different artist, drawing inspiration from the original light novel by Nobiru Kusonoki. The original creator was quite enthusiastic about the manga, but both she and the artist had significant differences in terms of creativity, leading to a decline in the manga’s production quality, focusing instead on family and writing skills.
4. I Won’t Become A Villainess. I’m Just A “Normal” Duke’s Daughter! – Canceled for various reasons

After being reincarnated as a supporting character in an otome game, Rosalind plans to use all her knowledge about the game to avoid a bad ending. Everything she desires is a happy life, and she will do anything to achieve her goals.
This manga is also based on a light novel of the same name. Although it tells the story of a supporting character, it contains many charming moments, and the light novel received significant acclaim from readers. Unfortunately, not much information has been released about the manga, as it has been on hiatus since 2022. It was reported that the manga was canceled after 11 chapters, and it is speculated that the reason is due to the creator’s health.
5. That Time I Got Reincarnated As A Slime: The Ways Of The Monster Nation – A spin-off of the original that has stopped production

This manga is based on a series of Light Novels (LN), and this particular story is part of a broader narrative of the main tale. That Time I Got Reincarnated As A Slime: The Ways Of The Monster Nation begins after volume 9 of the LN, following the Jura-Tempest Foundation’s expansion.
Most spin-off mangas tend to have a more condensed storyline, which is why they are successful. Unfortunately, this manga had to be abruptly canceled due to the creator’s declining health, and there have been no updates regarding its continuation.
6. Log Horizon – Hope arises or is it just a trap?

Log Horizon is a rather unique isekai series, appreciated for its intricate plotlines and humorous writing. The series combines elements of science fiction and fantasy, featuring the main character Shirou and his friends participating in a fantasy game where the storyline is predominantly determined by character interactions. The manga is a spinoff of the light novel, but unfortunately, it has been on hiatus for quite a while due to the creator’s health issues.
All information released is merely speculation, but it has been confirmed that the creator is currently facing personal challenges and cannot continue the light novel’s story. Therefore, the manga project has also been left in limbo, and viewers have yet to receive any updates regarding its continuation or cancellation.
7. I Want To Become The Hero’s Bride – A series canceled for various reasons

The main character Berlina has been reincarnated into a fantasy world and only has one goal in her new life: to pursue her love for the hero. The story is quite typical and brings enjoyable moments between Berlina and Chris.
The series concluded in two volumes, with no hope for the manga’s return. The publishing company has confirmed that the series has been canceled, but no specific reasons have been provided.
8. The Villainess Who Became A Nightingale – Stopped due to various reasons

This manga is adapted from a light novel that has brought a unique twist to the character development narrative. The story is captivating, artistically exquisite, and features well-loved characters.
However, it has been canceled by the publishing company. The artist is eager to collaborate with the creator in the future if the opportunity arises, but currently, nothing has been confirmed.