Phantom of Inferno is a hard-boiled crime drama published by Nitroplus. You follow a 15-year-old Japanese boy who, after witnessing a murder, is kidnapped by a mafia organization known as "Inferno." His memories are erased, and he is given a choice: join them or die. He is then trained to become the assassin "Zwei," working under his mysterious mentor, "Ein" (the top assassin, codenamed "Phantom"). The decisions you make throughout the story lead to a variety of endings, ranging from tragic action-dramas to more romantic conclusions.