Sentou Yousei Shoujo Tasukete! Mave-chan (戦闘妖精少女 たすけて！メイヴちゃん) is an OVA series produced by Bandai Visual.
Plot
Rei goes to an anime convention and ends up in a world created by the desires of anime fans. Rei doesn't know how to get back and the world starts to collapse because the convention is coming to a close.
External Links
Official
Other Sources
Other Wikis
References