Rentei (廉貞) is a shikigami in the shape of a koi fish, used by Yura Keikain. He is never used on his own, but rather merges with Yura to create a cannon attached to one arm. With this, Yura performs her Yomi Okuri, Yura MAX technique. He is named for the star Alioth of the constellation Ursa Major, which was called "Rentei" in scriptures from China's Tang Dynasty.