Overlord is written by Kugane Maruyama with illustrations by so-bin, and was initially serialized as a web novel in September 2010.
The wraparound band on the eleventh volume of light novel Overlord, which will go on sale tomorrow on September 30 will announce that the series will receive an anime movie.
A manga adaptation drawn by Fugin Miyama has been serialized in the Comp Ace magazine since November 2014.