Hoichiro Ohma is known for his restrained and unassuming nature in the workplace, and not even his girlfriend, Nanase, is aware of his greater role. As the Judge of Darkness, he oversees cases involving homicide, suicide, and other tragic fatalities. With the aid of the Laws of Darkness and a unique parrot companion, Hoichiro dispenses justice to those who might otherwise escape accountability. Utilizing an ancient book with a cover made of human skin as his reference, he guarantees that no criminal will elude deserving retribution.