I have an idea about this one when watching Re;Creator. The idea is like this: some fictional being suddenly being thrown to real world and have their power/abilities erased/vanished because of some rules.

Some fictional wouldn't end up with their OTP from their franchies, some will marry an ordinary man/woman of the real world.

The MC is a young girl who's about 10 years old who has mother from fictional side. Now, although some fictional power/abilities vanished completely, there will have some conflict or so, like rebels or anything.

MC is a half-fictional or half-creation (if we use Re;Creator term to call the fictional being). She will inherit some power/abilities from her mother.

Beware, this will still include 18+ and yuri, also harem of nee-san, loli, and MILF.