When Calvin finds a knife walking home he is engrossed with its tempting powers and learns of its means of bringing back a loved one—at the cost of killing a human. He kills his brother, Nathan, in order to ressurrect his life's love, Yui. However, complications arise when his brother rises from the grave as a flesh-eating monster bent on gaining untold power. And what's worse is Yui seems to have memories of when she was dead—a mystery that could have bigger implications than humanity could understand.