As established in the "Naruto" series, every shinobi's chakra has an affinity towards one of the five basic nature transformations. The five basic nature types are fire, wind, lightning, earth, and water. However, there are two unique nature types that exist outside of the basic five: The Yin Release and the Yang Release. The Yin Release is mental and spiritual energy used to control imagination to create forms out of nothingness. Since the Yin Release is associated with genjutsu, Kurenai Yūhi's nature type is classified as Yin Release.
Kurenai uses the Yin Release to fuel her genjutsu abilities, such as the Demonic Illusion: Tree Binding Death and Genjutsu: Flower Petal Escape. The Nara Clan uses the Yin Release to manipulate their own shadows, as demonstrated by Shikaku and his son, Shikamaru. The Yin Release is usually inherited among the Uchiha Clan, but — outside of Itachi Uchiha — most members of the Uchiha seldom make use of it.
