In the Kingdom of Heaven, an impulsive girl who has just arrived and a mysterious and sinister boy walk through the ups and downs of the world together as angel partners. And as their work progresses, what are the memories of their lifetime that gradually emerge, and what is the feeling of reappearing in the same streets and the same sea of flowers... When helping others ascend to heaven, do you also notice the thoughts of yourself and your partners? The value of life and death; the vicissitudes of the world; the time that you don't want to forget even if your soul is destroyed; the answers and knots in your heart will be solved, because I am by your side...