Emperor Kaika , also known as Wakayamato Nekohiko Ōbibi no Mikoto (若倭根子日子大毘毘命) in the Kojiki, and Wakayamato Nekohiko Ōbibi no Sumeramikoto (稚日本根子彦大日日天皇) in the Nihon Shoki was the ninth legendary emperor of Japan, according to the traditional order of succession. Very little is known about this Emperor due to a lack of material available for further verification and study. Kaika is known as a "legendary emperor" among historians as his actual existence is disputed. Nothing exists in the Kojiki other than his name and genealogy. Kaika's reign allegedly began in 158 BC. He had one wife and three consorts whom he fathered five children with. After his death in 98 BC, one of his sons supposedly became Emperor Sujin.

The Owari clan is a Japanese clan. The clan were originally Kuni no miyatsuko but after the abolition of the role they took on a priestly role at Atsuta Shrine. They share this history with the Izumo clan of Izumo-taisha, the Aso clan of Aso Shrine, the Munakata clan of Munakata Taisha, the Amabe clan of Kono Shrine and the Yamato clan of Ōyamato Shrine.