Forever Without You

She was just a girl; or she thought she was.
For centuries, Thomas and Freya have fallen in love, but in the end, they were always torn apart by death or otherwise.
This time, it's different. Thomas and Freya attend the same high school, and they meet once again; except Freya's mind flashes back and forth between the centuries they'd been in love with each other.
How does it all start this time? A dance.
To moonlight sonata.