Okazaki Shrine was founded in 794 by Emperor Kanmu as one of four shrines to protect Kyoto's Imperial Palace from evil forces—specifically guarding the eastern direction, earning it the name "Higashi-tenno" (Eastern King).

Rabbits are the shrine's divine messengers for three reasons: they symbolize fertility, represent the eastern direction in Chinese astrology (matching the shrine's protective role), and once roamed wild in the Okazaki area.

The "Koma Usagi" rabbit guardians at the entrance replace the traditional lion-dogs—one has its mouth open (male), one closed (female). Petting their heads is believed to bring happiness in marriage.

The shrine became associated with fertility in 1178 after an empress successfully gave birth here. The enshrined deities Susanoo and Kushinadahime had eight children together—three daughters and five sons.