Onmyōji (陰陽師) is a series of historical fantasy short stories and novels written by Japanese author Baku Yumemakura. It follows the story of a fictionalized version of the Heian period onmyōji Abe no Seimei, a master in onmyōdō, a traditional Japanese form of cosmology. A manga adaptation by Reiko Okano was serialized from 1993 to 2005; it won two major prizes (the Tezuka Osamu Cultural Prize and the Seiun Award), and begot a sequel, Onmyōji: Tamatebako, serialized from 2010 to 2017. Another manga series, Onmyōji: Taki Yashahime, by Munku Mitsuki, was serialized from 2012 to 2015.