She is the ghost princess who travels through time and space, looking for a memory, and only has one day's memory.
He said: Do you want to live again? I'll give you a thousand years. If you can get your memory back, I'll let you go back to that day and choose again.
She said: A thousand years, how long.
The bloody flowers of the other shore bloom beautifully beside the River of Forgetfulness.
No one heard the exchange agreement.
This went on for a thousand years.