'Isekai Tensei Dungeon Master' Vol. 3 Released! Hot Spring Collaboration & Special Video Launched

KADOKAWA Corporation released the third volume of the popular light novel series 'Isekai Tensei Dungeon Master: Onsen Dungeon wo Tsukuru' (Fantasia Bunko) on May 20, 2026.

The series, the novel debut of Amahara (original creator of 'Interspecies Reviewers'), has achieved remarkable success, including the #1 spot for first-month digital downloads in Fantasia Bunko history and winning first place in the Bunko category at the 'Next Light Novel Award 2025.'

To commemorate the release, a special collaboration is underway at 'Tamagawa Onsen,' a retro-themed hot spring in Saitama Prefecture: 1. Enameled Sign Ads: Displayed on the outdoor terrace (until May 31, 2027). 2. Sample Reading POPs: Excerpts from Vol. 1 available in the men's bath area (until June 27, 2026).

Additionally, a special introduction video by comedian Keigo Iwanaga (of the duo Lip Grip) is now available on his YouTube channel, 'Suke-Dai Channel.' Iwanaga provides a deep dive into the unique appeal of the series from his perspective.

A giveaway campaign for signed copies of the book is also being held on the official X (formerly Twitter) account. This multifaceted campaign highlights the series' unique theme of bringing Japanese onsen hospitality to a fantasy world through real-world experiences.