Amakawa Haruto, a twenty year old university student, loses his life when the bus he is on gets into an accident. As his consciousness begins to fade, his one regret is not telling his childhood friend, Miharu, how he felt. She'd disappeared after their high school entrance ceremony.
Now we move to the slums of the Kingdom of Beltrum. In a corner of a filthy shack, a boy named Rio moans and wakes from a nightmare. He has lived only to take revenge upon a certain man, but now, in his mind, suddenly there are flashes of another version of himself living in a world he's never seen before—the memories of Amakawa Haruto.
When I grow up, I'll come and get you!
!عندما أكبر، سآتي لأخذك
Wenn ich groß bin,
komme ich zurück zu dir!
¡Cuando sea mayor, vendré por ti!
Je viendrai te chercher
quand je serai grand !
Quando sarò grande verrò a cercarti!
Quando eu crescer, venho te buscar!
Когда вырасту, 
я обязательно тебя заберу!