What does the five-year gap mean?
If the boy is five years older than the girl, it is called just right; if the girl is five years older than the boy, it is called mismatched.
The five-year age gap is the gap between him and her.
She once tried bravely to cross over, but ended up in failure. Her heart was full of scars, and she had not recovered even after three years of recuperation.
Three years later, the fate of the two was entangled again, but this time the only gap in the middle was age?