Wandering Star

"I... I do not know... who I am. I can't seem to recall a thing. I remember being able to read... and write. Yet at this very moment... I do not know of my own origin." A boy fell from the crack in the sky. He was later found by a pair of sibling, Runa and Luis who dedicate themselves to figuring out the identity of said boy, unaware of the chains of fate that's connecting them to series of dangers awaiting. What is his identity, that even the universe itself tries to conceal from the three?