Okō commands Mortal Hell (Shugou Jigoku), a specialized bureau within Japanese Hell's administration responsible for punishing lust-related sins. This zone operates as Hell's red-light district for wardens, delivering ironic retribution to those guilty of sexual misconduct or perversion, mirroring their earthly crimes. Her duties involve overseeing tortures tailored to specific sins, such as trapping panty thieves within demon-worn underwear. She coordinates professionally with Hozuki, Hell's chief of staff, particularly on Mortal Hell operations. Okō embodies the afterlife's punitive bureaucratic efficiency, extending beyond simple administration. Within the series' spiritual hierarchy, she is a distinct entity, appearing as an obtainable shikigami in the crossover game "Onmyōji" alongside other characters.