Overlord Blu-ray 04 Special

Overlord Prologue (1st Half) is a side story in the Overlord series. It was released on December 25, 2015 in Box 4 of the Blu-ray & DVD Collection.

Main Summary
The story starts before the guild Ainz Ooal Gown came into existence. It's about the clan Nine's Own Goal which Momonga was a part of. During their meeting a clan member Nishikienrai informs them that he discovered an unexplored dungeon known as the Great Tomb of Nazarick. During the meeting, the clan leader Touch Me announces to the members he would be dissolving the clan and re-found them as an official guild. A new name for the guild was decided and Momonga was recommended by Touch Me as their guild leader, which was accepted by all the members. As the guild leader he announce to conquer Nazarick in one try as their first mission for their new founded guild.

Trivia

 * Information concerning the Neural Nano-Interface is only discovered here in this special.