Once a server admin for Yggdrasil, Tanabe Takahashi finds himself as a spectator to the exploits of Ainz Ooal Gown. With the events of the anime unfolding in front of him, Tanabe ends up a little attached to Shalltear and starts "intervening". Now the entire timeline is thrown into chaos. (There's also a temporary genderbend that doesn't last. )