Soku-no-Kumi

Soku-no-kumi is the yomi in Japanese mythology ruled by the god Amatsu-Mikaboshi. The realm of Soku-no-kumi is a parallel of heaven and reflects the bitterness of the goddess Izanami after she died giving birth to the fire god Kagutsuchi and ended up in the Underworld where she remained, trapped behind a boulder that the horrified Izanagi placed there.

Soku-no-Kumi residents are the souls of the sinful, spirits known as Shitidama who are violent beings more demonic in nature than humane. Occasionally these spirits do escape from Soku-no-Kumi and cause havoc on Earth. Due to his contempt for humankind, Amatsu-Mikaboshi does nothing to bring them back.