An anime adaptation of Level 1 Demon Lord and One Room Hero has been announced and is currently in the works. The anime production team released a commemorative illustration and a 36-second PV teaser trailer to celebrate news of the adaptation.
Naomi Ohzora will be voicing the titular Demon Lord while Yuuichi Nakamura will star as the hero, Max. More details about the animation production company and additional staff members will be released at a later date.
The anime is based on the original manga by tofu and was first published in March 2019. It is currently serialized in Houbunsha’s Comic Fuz magazine and has released five tankoubon volumes as of March 28, 2022.

Seven Seas Entertainment releases the manga series in English. They describe the story as:
The Demon Lord has been defeated by a brave warrior, but is destined to arise again! Ten years later, he emerges early from his slumber to exact his revenge. However, he returns to find that neither the world nor the legendary hero are what they once were. Can the powers of darkness triumph over…a shut-in slob?