It has been years since the massacre that killed off all the Reaper's Apprentices. Demons and humans are now at war. The only thing that can get them to fix the chaos is if they come together. However, this is going to be a difficult task. Demons and humans do not get along.
So what happens when a demon slayer makes a deal with a demon? That is what happens when the demon slaying group, DS461, finds themselves at the mercy of four demons. Even more, they are okay with making a deal with them. The problem is they don't know what kind of demons they've made their deal with. They don't know just what kind of adventure they are going to put themselves through. Above all, they have no idea just how close they are going to get to their enemies.