The Demiurge and The Greater King

When a strange, demented little man comes to the doors of Nazarick and asks to speak with Lord Ainz Ooal Gown, Demiurge decides to accept his request, thinking his Lord would at least gain some amusement.  Instead, after the man makes a fool of himself in front of Lord Ainz, claiming to be superior and demanding acquiescence, Lord Ainz surprisingly plays along, and worse yet, surprisingly assigns Demiurge to assist the man!

This is a fan-fiction based on Kugane Maruyama's light novel seriesOverlord(オーバーロード), as well as the anime based on it.