Kugane Maruyama 's Overlord light novel series revealed that it will end in two volumes.
Synopsis
Yggdrasil is a popular online game that suddenly has its servers shut down. Momonga, a young player, decides not to leave the game and is transformed into a skeleton, the Overlord. Having no family, friends, or place in real society, young Momonga decides to fight to dominate the new world the game has become.
Kugane Maruyama began the original light novel series online in 2010, and Kadokawa 's Enterbrain began publishing the series in print with illustrations by so-bin in 2012.
Source: ANN