Case's brother dies in police custody after he is falsely accused of a mass murder. Case is angry and bereft, knowing all too well there is nothing he can do to get justice for his brother. However on his brother's first birthday after his death, a strange girl approaches him. She gifts him with a geas that enables him to read and control anyone's mind when they are angry. Suddenly, things are not the same anymore. He is no longer powerless. Backed by his peculiar new power, Case decides if he cannot prove his brother's innocence, he'll at least try to avenge his death. But everything comes at a cost, more so when it's something stolen. When the Sin of Wrath appears before him demanding to have his power returned and vowing to ruin his life, Case is forced into a dangerous pact.