The Japanese Underworld (Yomi) is said to be ruled by Izanami. However, in the tale of Ōkuninushi, Susanno is said to reside there as its king. In addition to that, Izanamzi told Inzangi that she had to ask for permission to get out of Yomi.
Who did she need to ask for permission? A ruler/god of Yomi? Who is the real ruler of Yomi?