In the shadowy world of the Order of Shadows, a young boy named 621, raised from a tender age to be a remorseless instrument, embarks on a path that pushes the boundaries of darkness. As he grapples with the brutal training, sinister manipulation, and the eerie abilities of his fellow pawns, 621''''s journey takes unexpected turns. His enigmatic past, the cruel handlers, and the other mysterious pawns, all play a role in shaping the story''''s intricate tapestry.