When A Reaper Meets Devils (C)

(Inspired by MovieVillain's fanfic on FanFiction.net called Dhampir Meets Devil) AU. Ragna fell into the Boundary. Before his end, he remembered a girl he made a promise to. Now, he is the world she came from. Now, will they both remember that spark while life goes on for those two, or, will the darkness of life consu...