When Aoi died for the first time, she realized that death is not the end, but just the beginning.
Life is just a game. Only if you can pick it up and put it down again are you qualified to play the game.
Aoi is not a qualified player, but she is an interesting toy. No matter how many times she drops it, she will pick it up again.
There is no stopping place in the cold and long journey, but once it begins, it cannot end.