RealDol

RealDol follows someone reincarnated as an extra character in the magical-girl anime their niece used to watch. In a world where stones replace people, they hope to avoid getting involved and survive until they can return home.

That plan unravels when the final boss arrives at their house, and the protagonist suddenly quits being a magical girl and shuts herself away. A time traveler who was not part of the original story then appears, saying they must help save the doomed world if they want to go home. He knows the name of the protagonist’s niece, who does not exist in this world, and asks them to trust him—or at least trust the name ■■■.