The Blood Reaper is a story that revolves around our lazy and blunt main character Izuki Yasubei. A young boy who didn't care much about school and preferred to sleep instead of talking to people. One disaster led to another and he ends up doing the unthinkable and made a contract with a demon named Kozak. Not knowing the consequences of the contract Izuki has to kill in order to stay alive. But can he do it?, Why did the demon choose him?. What trials will he have to go through and what choices will he have to make in order to survive?