I'm not sure. It might have some roots in truth, but it could also be a creation of the author's imagination. We don't have enough information to know for certain.
It's a story - driven game. It might be about the events that occur within a bunker. Maybe it's about survival, relationships among the people in the bunker, or some mystery that unfolds there.
I'm not sure specifically which 'girl in bunker story' you are referring to. It could be about a girl who is taking shelter in a bunker for various reasons, like during a war, a natural disaster, or some other dangerous situation.
The story of 'The Girl in the Bunker' is not true. It's a made-up tale that might draw inspiration from various sources but doesn't reflect actual happenings in the real world.