kai was originally an American human who was born in japan who would later have three younger siblings. he was a huge fan of Japanese myth, and all of mythology to be honest but it was mostly Shinto myth. he would go onto do many bad things to make sure his siblings lived a happy and comfortable life after their parents death. he died when he was mauled by a pack of foxes while on his way home from a job. he arrived in hell eight years before the series begins disclaimer- no pictures or videos or gifs that i use are mine.