Cleyera japonica (sakaki) is a flowering evergreen tree native to warm areas of Japan, Taiwan, China, Myanmar, Nepal, and northern India. It can reach a height of 10 m. The leaves are 6–10 cm long, smooth, oval, leathery, shiny and dark green above, yellowish-green below, with deep furrows for the leaf stem. The bark is dark reddish brown and smooth. The small, scented, cream-white flowers open in early summer, and are followed later by berries which start red and turn black when ripe. Sakaki is one of the common trees in the second layer of the evergreen oak forests. It is considered sacred to Japanese Shintō faith, and is one of the classical offerings at Shintō shrines including Tamagushi and masakaki.

Shinto is a religion originating from Japan. Classified as an East Asian religion by scholars of religion, its practitioners often regard it as Japan's indigenous religion and as a nature religion. Scholars sometimes call its practitioners Shintoists, although adherents rarely use that term themselves. There is no central authority in control of Shinto, with much diversity of belief and practice evident among practitioners.