Long-Running Dungeon Management Fantasy 'How to Build a Dungeon: Book of the Demon King' Manga Adaptation Concludes! Free 3-Volume Campaign Now Underway!

The manga adaptation of the popular Monster Comics title 'How to Build a Dungeon: Book of the Demon King,' which has been loved by everyone for about eight years, is finally coming to an end!

To commemorate the release of the final 16th volume on Monday, March 30th, we are holding a campaign to make the first three volumes of the manga available for free, so please check it out.

◆ Work Overview

Manga: Suzume Yamaneko (Volumes 1-3), Rumi Matsunami (Volumes 4-16) Original Story: Yukidaruma Original Character Design: Falmaro

<Synopsis> One day, the protagonist, Yuki, is transported to another world by the goddess Luna and asked to manage a dungeon. While summoning monsters and earning DP, a party of swordsmen wanders in, and he must repel them as a dungeon master. Taking in beautiful girls of various races as his wives—including a princess with a secret, a beast-eared girl, an elf, a succubus, and a goddess—he starts by building a hot spring inn and eventually develops the dungeon into a nation that involves the entire continent. This is a grand dungeon management fantasy!

The manga adaptation, which has been loved for about eight years since the release of the first volume in 2018, finally concludes with the 16th volume released on Monday, March 30th. What will be the result of his confession to Duchess Samantha...!? The digital version will also be released simultaneously.

Furthermore, the 25th volume of the original novel, which began serialization on 'Shosetsuka ni Naro' in 2014, is scheduled to be released by Monster Bunko on Tuesday, June 30th! This is the 'Summoning Arc,' where Yuki and his companions, who were suddenly summoned into the middle of a war between distant great powers, suppress both countries with overwhelming military force. In this volume, they finally close in on the mastermind who incited the war!

We hope you take this opportunity to enjoy both the manga and the novels.

◆ Free Release Campaign

On the official Futabasha app 'Manga Gaugau' and the web manga site 'Gaugau Monster+', we are releasing 15 chapters covering volumes 1 through 3 of the manga for free all at once!

This is a limited-time offer until Friday, April 17th, so don't miss it!

▼ Manga Gaugau https://gaugau.futabanet.jp/list/app

▼ Gaugau Monster+ ('How to Build a Dungeon: Book of the Demon King' Chapter 1) https://gaugau.futabanet.jp/list/work/5dcea82e7765611358000000/episodes/1

◆ Bibliographic Information

'How to Build a Dungeon: Book of the Demon King' Volume 16 Manga: Rumi Matsunami / Original Story: Yukidaruma / Original Character Design: Falmaro Release Date: March 30, 2026 List Price: 792 yen (Base price 720 yen) Publisher: Futabasha Label: Monster Comics Details: https://www.futabasha.co.jp/book/97845754238220000000

◆ Author SNS

Original Story: Yukidaruma https://x.com/sonwbookman

Manga (Volumes 1-3): Suzume Yamaneko https://x.com/suzumeyamaneko_

Manga (Volumes 4-16): Rumi Matsunami https://x.com/matsunami