Himitsu: Kuro no Chikai

A young angel named Rin becomes enamored with a human girl named Miku, but their relationship is forbidden. To be with her, Rin bargains with the devil to be reborn as a human boy named Len. Despite their efforts, the time they spend together is brief and ultimately ends in sorrow.

Isinasalin pa — orihinal na teksto sa English.