In the mundane setting of an office, Hoichiro Ohma is known as a reserved and modest individual. Little do his colleagues, including his girlfriend Nanase, realize that beneath this facade lies a hidden identity. Unbeknownst to many, he holds the enigmatic title of Judge of Darkness. Armed with a book bound in human skin and accompanied by a peculiar parrot, Ohma executes justice according to the Laws of Darkness. His eerie duty involves presiding over cases of murder victims seeking retribution and souls burdened with curses in a realm where conventional justice falls short.