The Mijissou no Last Boss-tachi ga Nakama ni Narimashita (The Unimplemented Overlords Have Joined the Party!/ 未実装のラスボス達が仲間になりました。) light novel series by Nagawasabi64 and Kawaku will end with the release of the 10th novel on August 29th, 2025.
Nagawasabi64 started the story in March 2020 on the Shousetsuka ni Narou website. Kadokawa published the first novel, with illustrations by Kawaku, in November 2020 and the ninth novel in January 2025.
The novel series was adapted into a manga by Hirokawa Tomo in November 2021 on Kadokawa’s Comic Walker website, and Kadokawa published the manga’s first tankoubon volume in May 2022. The manga’s sixth volume will be released on July 26th, 2025.
Yen Press publishes the novel series in English under the name The Unimplemented Overlords Have Joined the Party!, and it will release the fifth novel on December 9th, 2025. Yen Press describes the first novel’s story below:
“THREE’S A CROWD… BUT SIX OVERLORDS?!
Young gamer Shuutarou is among the lucky few chosen to playtest Eternity, the latest VRMMORPG, and he wastes no time in activating his unique Create Dungeon skill…at the exact moment the game glitches! Now he and his fellow playtesters are trapped, and their lives are at stake. Shuutarou happens to end up in the one area that has yet to be patched into the game: the final-boss lair where the six Evil Overlords lurk. They promptly declare him their master— and with Eternity’s strongest baddies on his team, Shuutarou is up for any adventures this new life throws at him!”
