Dungeon Last Boss Sasen Ojisan: Kakedashi Haishin Shoujo o Tasuketara Nazeka Chuumokudo Kyuu Joushou Volume 2 will be published in Japan on September 1, 2026.
KADOKAWA and Kadokawa Sneaker Bunko have revealed its latest cover. The sequel sends former dungeon final boss Jiro Yasegawa back to Hiroshima after memories from his human life suddenly return.
Quick Summary
- Japanese title: ダンジョンラスボス左遷おじさん２ ～駆け出し配信少女を助けたらなぜか注目度急上昇～
- Romanized title: Dungeon Last Boss Sasen Ojisan 2: Kakedashi Haishin Shoujo o Tasuketara Nazeka Chuumokudo Kyuu Joushou
- Official English/global title: not announced
- Format: light novel
- Latest volume: Volume 2
- Release date: September 1, 2026
- Publisher: KADOKAWA
- Imprint: Kadokawa Sneaker Bunko
- Author: Giaman
- Japanese author name: ぎあまん
- Illustrator: Sanada Keisui
- Japanese illustrator name: さなだケイスイ
- Price: 924 yen including tax
- Base price: 840 yen before tax
- Format: bunko
- Page count: 294
- ISBN: 978-4-04-117743-3
- Protagonist: Jiro Yasegawa
- Japanese name: 八瀬川次郎
- Primary Volume 2 location: Hiroshima
- Important new character: Sana
- Sana's role: rookie D-Tuber and Jiro's biological niece
- Sana's conflict: family problems and despair over her own talent
- Other elements: dungeon convenience store, government requests, and an elf
- Genres: modern fantasy, dungeon, action, comedy, and return-from-isekai
- Original format: web novel on Kakuyomu
- Web novel status: still available and ongoing
- Award: Kakuyomu Contest 10 Professional Writer Category Special Award
- Volume 1 release: January 30, 2026
- Anime adaptation: not announced
- Manga adaptation: not announced
Official Announcement and Volume 2 Cover
Jiro Recovers Memories from His Human Life
After returning to Earth, Jiro Yasegawa has finally begun enjoying the relaxed modern life he was denied while working as a dungeon final boss.
A sudden incident changes that routine when memories from his earlier human life begin returning.
Those memories reconnect Jiro with his hometown of Hiroshima, leading him back to a place carrying unresolved ties from before his death and reincarnation.
The sequel therefore shifts part of its focus toward his family.
Volume 1 primarily explored Jiro's return to Earth and his adjustment to a society where dungeons now exist. Volume 2 uses that foundation to connect his overwhelming fantasy-world strength with a much more personal part of his old life.
Rookie D-Tuber Sana Is Jiro's Niece
Inside a Hiroshima dungeon, Jiro encounters Sana, a rookie D-Tuber whom he had secretly been supporting.
Within the series, D-Tubers are creators whose content and broadcasts revolve around dungeon activities.
Sana is still struggling to establish herself both as a streamer and as someone capable of surviving the increasingly competitive dungeon environment.
Their meeting produces a major revelation: Sana is actually Jiro's biological niece.
She is struggling with a difficult home situation and has begun losing confidence in her own abilities. Rather than continue watching from a distance, Jiro decides to help her directly.
That decision puts him into conflict with overbearing members of her family and turns his extraordinary power toward a problem that cannot be solved simply by defeating a monster.
The Dungeon Convenience Store Is Still Busy
Jiro's return to Hiroshima does not mean his other responsibilities disappear.
His dungeon convenience store continues operating as part of his new life.
The business draws on knowledge acquired through years spent on the monster side of dungeon society. Jiro understands what explorers need before and during a dungeon run better than most conventional business owners.
This gives the sequel a quieter layer alongside its battles.
Jiro is not only a former final boss capable of overwhelming modern enemies. He is also someone actively trying to build a normal life after finally escaping an exhausting job that lasted far longer than any ordinary career.
The Government Has Another Job for Him
Jiro's abilities are too extreme to remain completely outside official attention.
Volume 1 established that he can perform feats such as transforming into a dragon and applying powerful buffs to allies.
Against that background, contemporary Earth dungeons often appear relatively manageable to someone who once defended the deepest floor of another world's dungeon.
Volume 2 includes a government dungeon-clearing request, placing Jiro once again in a role connected to large-scale dungeon operations.
The prerelease synopsis does not identify the exact dungeon, objective, or enemy involved.
It does, however, reinforce the strange reversal at the center of the series: someone who once existed as the dungeon's final obstacle is now helping humanity clear them.
An Elf Suddenly Appears at Jiro's Apartment
Another problem reaches Jiro without requiring him to enter a dungeon at all.
The official synopsis says that an elf suddenly appears at his apartment, eventually leading to the two fighting together.
The elf's identity, origin, and reason for appearing on Earth remain undisclosed.
Her presence may expand the connection between modern Earth and the fantasy world in which Jiro once lived, although the publisher has not confirmed exactly how the two are related.
Whether she arrived through a dungeon, from Jiro's former world, or by another method is one of the questions being saved for the volume itself.
From Salaryman to Dungeon Final Boss
Before becoming one of the strongest figures in this new modern dungeon era, Jiro was an overworked salaryman who died in contemporary society.
He was reincarnated as a dungeon monster in another world and repeatedly evolved until he became powerful enough to guard its deepest area as the final boss.
After years of service, his goddess superior decided that maintaining him cost too much.
Jiro was dismissed and sent somewhere unexpected: Earth, where almost no time had passed since his death.
But the Earth he returned to had developed dungeons of its own.
His experience, abilities, and perspective as a former boss immediately placed him far beyond the normal standard of contemporary dungeon explorers.
Volume 1 Introduced Mimimi
The first book introduced Amanogawa Mimimi, a girl broadcasting from inside a dungeon.
When Mimimi was placed in danger, Jiro rescued her with abilities he considered ordinary but that looked completely absurd to anyone watching the stream.
The incident caused rumors about a mysterious and overwhelmingly powerful middle-aged man to spread online.
From there, Jiro became increasingly involved with dungeon explorers, streamers, government officials, and other people who slowly became aware of what he could do.
Volume 2 builds on that foundation while giving him a far more personal reason to intervene.
Why This Matters
1) The sequel moves into a family conflict
Jiro is no longer helping only strangers and explorers. Sana's situation connects directly to his forgotten human past.
2) His human memories are becoming important
The return of those memories opens an entirely new side of Jiro beyond his identity as a former monster and dungeon boss.
3) Modern Earth keeps colliding with fantasy elements
Dungeons are already part of everyday society, and the sudden appearance of an elf expands the mystery surrounding the world's transformation.
4) The series keeps mixing action with ordinary life
Between overwhelming enemies, Jiro still has to manage a business, an apartment, government relationships, and people who increasingly depend on him.
Light Novel Information
The important details currently known are:
- Dungeon Last Boss Sasen Ojisan is written by Giaman
- Sanada Keisui provides the illustrations
- Kadokawa Sneaker Bunko publishes the print edition
- Volume 1 was released on January 30, 2026
- Volume 2 releases on September 1, 2026
- Volume 2 costs 924 yen including tax
- it contains 294 pages
- its ISBN is 978-4-04-117743-3
- the sequel sends Jiro back to Hiroshima
- Jiro recovers memories from his human life
- rookie D-Tuber Sana is revealed to be his niece
- Sana is struggling with her family and confidence in her talent
- Jiro decides to help her
- the dungeon convenience store remains part of the story
- the government asks Jiro to handle another dungeon-clearing mission
- an elf also appears at his apartment
- the story originated as a Kakuyomu web novel under a different title
- it received the Kakuyomu Contest 10 Professional Writer Category Special Award
- no anime or manga adaptation has been announced
- Volume 2 details are available through the official KADOKAWA page
- series information is available through Kadokawa Sneaker Bunko
- the original web novel is available through Kakuyomu
Closing
Dungeon Last Boss Sasen Ojisan Volume 2 moves Jiro away from purely casual post-final-boss life and toward a family conflict rooted directly in his forgotten past.
His encounter with Sana in Hiroshima drives the new storyline, while the dungeon convenience store, a government request, and an unexplained elf keep the series' modern-fantasy scale intact. The book launches in Japan on September 1, 2026.
- Kadokawa Sneaker Bunko Official X — Volume 2 Cover Reveal and September 1 Release Reminder
- KADOKAWA — Official Volume 2 Release Date, Synopsis, Price, Page Count, and ISBN
- Kadokawa Sneaker Bunko — Official Volume 2 Product Listing
- KADOKAWA — Official Volume 1 Synopsis and Publication Information
- Kakuyomu — Original Web Novel, Series Status, and Kakuyomu Contest 10 Award Information
- Kakuyomu Publication — Official Book Edition Page and Series Information
