Tokiwa Shrine stands within the grounds of Kairakuen and enshrines Tokugawa Mitsukuni (1628–1700) and Tokugawa Nariaki (1800–1860), the two most revered lords of the Mito domain. The shrine is a quiet, dignified place even during the crowded plum festival season, with a forested approach and a small main hall.
Both men have near-legendary status in Mito. Mitsukuni is remembered as a learned, just ruler and the patron of Japan's greatest historical chronicle; Nariaki as the reformer who created Kairakuen and whose son eventually became the last shogun of Japan. The shrine is worth visiting in combination with Kairakuen — it adds a dimension to the garden's history.