(the girl is) an unsolved mystery

Nobody knows, nobody knows where she appeared.
Yeah, no one thinks, nobody thinks that that is weird.
No one has ever seen inside the place where she resides.
No one has ever spent any amount of time by her side.
The girl is an unsolved mystery.

She means everything in the world to me.
I'd like to get her face to face.

I'd really like to crack this case.
I'd like to get her face to face.

I'd really like to solve this case.