Kei Murayama is a Japanese manga creator, known for both writing and illustrating original works. Murayama is the author and artist of the manga series A Centaur's Life, which won the eighth Comic Ryujin Award in Japan. This series, known in Japan as Centaur's Worries, has been serialized in Tokuma Shoten's Monthly Comic Ryu magazine since February 2011. The series is a long-running slice-of-life comedy with supernatural elements, focusing on the daily high school experiences of Himeno, a shy centaur girl, and her friends who are various mythological creatures. The English version of the manga is published by Seven Seas Entertainment.

A Centaur's Life was adapted into an anime television series that aired in Japan from July to September 2017, consisting of 12 episodes. The anime was produced by the studio Emon, with Fumitoshi Oizaki serving as chief director and Naoyuki Konno as director. In addition to this work, Murayama is also credited as the creator of the manga Mushroom Girls in Love.