Top 19 Underrated Japanese Adventure Novels in 2026

2026 Edition

Updated January 27, 2026

Editor's Picks

19 Novels

Underrated Japanese adventure means novels with good ratings from readers who found them but without the visibility that anime adaptations or major publisher pushes provide. The isekai space is crowded enough that plenty of solid entries get overlooked despite executing well.

These novels still deliver exploration, discovery, and progression. Some take unusual approaches to familiar setups, others have premises that limited initial appeal. For readers who've read the obvious recommendations and want to explore further, this list offers alternatives that earned their ratings from engaged readers.

1
TOP PICK
My Death Flags Show No Sign of Ending
4.5
(2.0K ratings)
Genre: action, adventure, drama
When he came to his senses, Hirasawa Kazuki, a normal university student, found himself in possession of the body of a game’s character. Moreover, it was Harold Stokes, the story’s most hated character who was even given the title 『King of Tr*sh』by the players.
First Impressions
"My Death Flags Show No Sign of Ending" has been quite the ride! Jumping into this isekai adventure, I was immediately hooked by the unique premise. It's not every day you see a protagonist reincarnated as a villain, especially one with a rather… unfortunate speech impediment. The initial chapters grabbed me with their blend of humor and intrigue. The protagonist, a university student reborn as Harold Stokes, a hated character from a game he loves, immediately has to navigate a world where his words constantly betray his intentions. It's a clever twist on the usual isekai formula and sets the ...
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2
RUNNER UP
Overlord (LN)
4.5
(1.6K ratings)
Genre: action, adventure, drama
In 21st century, world entered a new stage of VR games…and “YGGDRASIL” is considered top of all MMORPG…but, After announcing that all its servers will be off, the internet game ‘Yggdrasil’ shut down…or so was supposed to happen, but for some reason, the player character did not log out some time ...
First Impressions
"Overlord" is a web novel that really grabbed my attention, and I can definitely see why it has such a dedicated following. It's a unique take on the isekai genre, and while it might not be for everyone, it offers a compelling experience that sets it apart from the usual light novel fare. Initially, I was drawn in by the premise: a player trapped in a game as an all-powerful undead overlord. It's a classic setup, but "Overlord" quickly establishes its own identity. The main character, Ainz (formerly Momonga), isn't your typical hero. He's a complex character, still clinging to his human past w...
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Completed
3
HIGHLY RECOMMENDED
Demon Noble Girl ~Story of a Careless Demon~
4.5
(1.1K ratings)
Genre: adventure, comedy, fantasy
She had a dream: the world was brimming with light. Family.
First Impressions
Alright, let's dive into "Demon Noble Girl ~Story of a Careless Demon~." This web novel is quite the ride, and I can see why it has garnered so much attention. It's a blend of genres that, when executed well, can be incredibly satisfying, but also has the potential to be a bit of a mess if the balance isn't right. The premise is definitely intriguing. We have a demon reincarnated as a human noble girl, a setup that promises a mix of fluffy slice-of-life moments and dark, potentially brutal undertones. The initial chapters certainly lean into the "cute" aspect, and I felt like I was settling in...
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Completed
4
EDITORS CHOICE
Apotheosis of a Demon – A Monster Evolution Story
4.5
(798 ratings)
Genre: action, adventure, drama
A back-to-basics(? ) monster evolution novel.
First Impressions
"Apotheosis of a Demon – A Monster Evolution Story" promised a unique take on the isekai genre, and after diving in, I can say it mostly delivers, though not without a few stumbles along the way. The story follows Shedy's journey from abused human to demon goddess, and it's a wild ride. I was immediately drawn in by the premise. A protagonist who isn't afraid to get her hands dirty and doesn't bother with "righteous" justifications? Sign me up! The initial chapters are compelling, and I found myself eager to see how Shedy would navigate this new, dangerous world....
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Completed
5
EDITORS CHOICE
It’s Because You Said There Would Be Candy!!
4.7
(641 ratings)
Genre: adventure, comedy, fantasy
A messenger of heaven appeared among the chaotic crowds Carrying in hand a sacred treasure, and the flames of hope Alongside those that sought out their destines To seal the root of evil, the lord of ...
First Impressions
This web novel was a delightful surprise! I went in expecting a light and fluffy read, and that's exactly what I got, but with an extra helping of charm. It's the kind of story that leaves you with a warm feeling, like you've just eaten a perfectly baked cookie. The premise alone – a pastry chef becoming a hero – hooked me immediately. The title, "It’s Because You Said There Would Be Candy!!," is just so whimsical and promises a fun, unconventional adventure. From the first chapter, I was drawn into Marie's world, a world where the solution to most problems involves a delicious baked good....
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Completed
6
#6 PICK
Fake Saint Of The Year
4.7
(695 ratings)
Genre: adventure, comedy, fantasy
Fudou Niito, a resident of Japan, went to bed dissatisfied with the ending of the game. When he next awoke, he found himself in the body of the game’s hated fake saint, Elrise.
First Impressions
"Fake Saint Of The Year" really took me by surprise. Going in, I expected a fairly standard gender-bender isekai, but what I found was a surprisingly deep and engaging story that kept me hooked until the very end. Initially, I'll admit, I wasn't entirely sold. The early chapters felt a little clumsy, and I wasn't quite connecting with the protagonist, Elrise. The world-building felt a bit rushed, and I was wondering if this would be another generic isekai. However, I'm really glad I stuck with it, because the story really takes off after the first few chapters....
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Completed
7
#7 PICK
Shini Yasui Kōshaku Reijō to Shichi-nin no Kikōshi
4.5
(638 ratings)
Genre: action, adventure, fantasy
On one spring evening when I was eight years old, I, Erica, Duke of Aurelia’s daughter, realized something. Huh, I have reincarnated into a fantasy world, haven’t I?
First Impressions
"Reincarnated as a villainess" stories are a dime a dozen, so I went into Shini Yasui Kōshaku Reijō to Shichi-nin no Kikōshi with a healthy dose of skepticism. However, I quickly found myself pulled in by the unique premise and the promise of more than just your typical otome game fare. The detailed world-building and hints of mystery piqued my interest from the start, and I was eager to see how Erica would navigate her perilous situation. The strongest aspect of this novel, in my opinion, is its world-building. The author has clearly put a lot of thought into the intricacies of the world, fro...
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Completed
8
#8 PICK
Kono Subarashii Sekai ni Shukufuku o!
4.5
(625 ratings)
Genre: action, adventure, comedy
Kazuma Satou is a shut in who loves games, and his life ended suddenly… appearing before him is a beautiful girl claiming to be a goddess. Kazuma, who was transported into another world, worked hard to earn a living!
First Impressions
"KonoSuba" has been on my radar for a while, and diving into this isekai comedy was quite the experience. It's definitely not your typical power-fantasy, and that's precisely where its charm lies. The novel gleefully subverts tropes, and I found myself chuckling at the sheer absurdity of the situations our protagonist, Kazuma, finds himself in. The premise itself is hilarious: a NEET dies a pathetic death and is offered a second chance in a fantasy world, with the option to bring one item or ability. In a moment of spite, he chooses the goddess Aqua, and that's where the real chaos begins. My ...
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Completed
9
#9 PICK
The Bathroom Goddess
4.7
(487 ratings)
Genre: adventure, comedy, fantasy
“The heck are you? A peeper?
First Impressions
"The Bathroom Goddess" is a delightful surprise! I went in expecting a simple comedy and found a cleverly woven fantasy adventure that completely charmed me. It's a relatively short read, which made it easy to devour in one sitting, and I'm already itching to revisit it. The premise is undeniably quirky: a woman, often unclothed, finds her bathroom window acting as a portal to another world. I was immediately hooked by the absurdity and the potential for humor. The initial chapters set the stage well, introducing us to the protagonist and the strange occurrences in her bathroom with a lighthea...
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Completed
10
#10 PICK
She Was Both Called God, as Well as Satan
4.5
(413 ratings)
Genre: adventure, fantasy, mystery
In the distant future on Earth, there was a girl with God-like powers. That girl is the last survivor of the former human race that flourished in ancient times.
First Impressions
"She Was Both Called God, as Well as Satan" is definitely a novel that sticks with you. With its blend of adventure, fantasy, mystery, and even a dash of sci-fi, it's quite the unique cocktail. The premise alone – an immortal being observing the rise and fall of civilizations – is enough to grab your attention. Initially, I was drawn in by the sheer originality of the concept. The idea of an ancient human, the last of her kind, watching over a new race struggling with magic and their own evolution is fascinating. It felt like a grand-scale social experiment, viewed through the lens of someone ...
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11
#11 PICK
Vermillion
4.5
(336 ratings)
Genre: action, adventure, fantasy
Western VRMMO【DEMONDAL】was known for its extremely harsh game system. To begin with, there were no levels.
First Impressions
"Vermillion" definitely grabbed my attention with its unique take on the VRMMORPG-turned-reality trope. The premise is intriguing: two people, skilled in a hyper-realistic VR game, find themselves trapped in a world that mirrors it. I was eager to dive in and see how this story unfolded. Initially, I found myself hooked by the world-building. The author paints a gritty, realistic picture, devoid of many of the typical game mechanics you'd expect. This lack of levels and health bars adds a sense of realism, making the stakes feel higher. However, I also felt the pacing was slow....
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Conclusion

Visibility in Japanese novels correlates heavily with adaptation status. The underrated entries here didn't get that boost but still work for readers who find them. If you want adventure that isn't on every recommendation list, start here.

Frequently Asked Questions

Our rankings consider multiple factors: reader ratings (40%), popularity and reading lists (25%), review quality (20%), and editorial assessment (15%). We update regularly to reflect new releases and changing reader preferences.

We update our rankings monthly to ensure they reflect the latest reader ratings and new novel releases.

How We Create Our 2026 Rankings

Our 2026 novel rankings are created through a comprehensive, data-driven process that combines quantitative metrics with qualitative editorial review. Here's how we ensure our rankings reflect the best novels available today.

Data Collection

We aggregate reading data, ratings, and engagement metrics from thousands of readers across multiple platforms, updated regularly throughout 2026.

Community Input

Reader ratings and reviews form the foundation of our rankings. We weight votes based on verified reading history to ensure authenticity.

Quality Scoring

Each novel receives a composite score based on average rating, vote count, reading list additions, and reader retention metrics.

Editorial Review

Our editorial team reviews top candidates for writing quality, translation accuracy, and overall reader experience.

Regular Updates

Rankings are refreshed quarterly to reflect new releases, updated ratings, and shifting reader preferences in 2026.

Transparency

We publish our methodology openly so readers understand exactly how novels earn their positions in our rankings.

Our 2026 Ranking Criteria

40%Reader Rating Score (weighted by vote count and recency)
25%Popularity Metrics (reading list additions, active readers)
20%Engagement Score (comments, reviews, recommendations)
15%Editorial Assessment (writing quality, translation, completeness)

Last updated: January 27, 2026 | Rankings reflect data collected through 2026

Ranked Novels

My Death Flags Show No Sign of Ending

First Impressions

Overlord (LN)

First Impressions

Demon Noble Girl ~Story of a Careless Demon~

First Impressions

Apotheosis of a Demon – A Monster Evolution Story

First Impressions

It’s Because You Said There Would Be Candy!!

First Impressions

Fake Saint Of The Year

First Impressions

Shini Yasui Kōshaku Reijō to Shichi-nin no Kikōshi

First Impressions

Kono Subarashii Sekai ni Shukufuku o!

First Impressions

The Bathroom Goddess

First Impressions