Sentou Yousei Shoujo Tasukete! Mave-chan

Rei attends an anime convention, only to find herself transported to a world based on the collective desires of the fans in attendance. This world, created by the fans' imagination, is already beginning to deteriorate as the convention draws to a close. With no clear way to return home, Rei must navigate the crumbling world of Sentou Yousei Shoujo Tasukete, also known as Mave-chan, a world where fans' wishes are turning into chaos.