Mataichi commands a trio of supernatural enforcers called the Ongyou, dedicated to punishing those whose crimes invoke their scrutiny. Shrouded in bandages and disguised as a wandering monk or charm peddler, he weaves psychological manipulation and calculated deception to expose his targets’ transgressions, crafting scenarios that compel them to confront their guilt before administering karmic retribution. Each execution concludes with an ofuda placed on the victim’s remains to guide their passage to the afterlife, accompanied by a solemn ritual incantation.

Bound by a spiritual code that elevates punitive justice above conventional heroism, Mataichi’s actions occasionally tread a murky divide between righteousness and ruthlessness. He dissects human nature with pragmatic precision, dismantling others’ idealism by exposing their entanglement in moral compromises. As the Ongyou’s leader, he collaborates with Ogin, a puppeteer, and Nagamimi, a shapeshifter, orchestrating intricate schemes that unravel hidden truths behind each mission.

His allegiance lies with the enigmatic Kyogoku Tei, a superior who initially directs the Ongyou’s tasks but later schemes to unleash a cataclysm powered by human anguish. This betrayal culminates in a sacrificial clash where Mataichi and his allies thwart Kyogoku Tei’s ambitions, their final destiny left unresolved. Throughout, Mataichi retains an inscrutable, detached presence, seldom divulging motives beyond his duty to reconcile moral reckoning with humanity’s inherent shadows.

No records detail his origins, age, or life before the Ongyou—his identity exists solely as a conduit for karmic judgment. His narrative arc resists personal evolution, steadfastly fixated on his mission, though fleeting interactions subtly suggest an unvoiced comprehension of human frailty and resilience.