Kurayami Santa(2015)

Kurayami Santa is a supernatural series set during Japan's Shouwa era, where unchecked greed threatens to overwhelm Hell itself. King of Hell Enma Daiou summons a small boy named Santa to the human world with a single directive: reduce the tide of selfish souls destined for damnation. Armed with no rules or guidelines, Santa must navigate a corrupt society and find his own methods to curb humanity's wickedness. When a lightning strike deposits him in a cemetery, the young envoy discovers that humans are far more depraved than he anticipated. Balancing the forces of light and dark, Santa embarks on a mission to restore moral order to the world above while preventing Hell's collapse. The series blends dark fantasy with moral reckoning, exploring whether one boy can truly change the hearts of a greedy nation.