Clementine escapes from almighty Ainz's gaze, and Albedo with the help of Aura, Mare, and a gratuitously large army of poorly-animated CG goblins must track her down, and eliminate anything that stands in her way, Guardian.

For twelve years, the virtual world of Yggdrasil has served as the playground and battlefield for the skeletal lord Momonga and his guild of fellow monsters, Ainz Ooal Gown. But the guild's glory days are over, and the game is shutting down permanently. When Momonga logs in one last time just to be there when the servers go dark, something happens--and suddenly, fantasy is reality. A rogues' gallery of fanatically devoted NPCs is ready to obey his every order, but the world Momonga now inhabits is not the one he remembers. The game may be over, but the epic tale of Ainz Ooal Gown is only beginning... (Source: Yen Press)

Specials featuring super-deformed characters, bundled with the Blu-ray and DVD volumes of Overlord. 
 Note: Began airing after episode 5 of Overlord - each episode was available on the official site for a short period afterwards.

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