The Twelve Kingdoms

The Twelve Kingdoms tells several stories from the world of the Twelve Kingdoms, located on a group of several islands in another dimension accessible from our world through portals created from naturally-occurring magic (though the other way around is normally impossible). The portals occur in the ocean waters of Japan and China, and every so often will end up dragging someone from our world from those waters to the kingdoms' islands, and/or on rare occasion, pulling an unborn child from the kingdoms into our world, causing them to be born there. On the islands, magic works and societies similar to those of classical Japan and China exist. While the inhabitants of the kingdoms are aware of the existence of our world as the lands of Hourai (Japan) and Kunlun (China), the reverse is not true for any inhabitants of our world. The inhabitants of the kingdoms speak a different language than the languages of our world, both of which can be learned by either side. Only by through extraordinary circumstances can the two worlds affect each other to a respective certain extent.

In this world, there are a total of thirteen lands. At the center of the world lies the Koukai (the Yellow Sea) and Five Mountains where the Gods communicate their will to the Twelve Kingdoms of the world. Each of the Twelve Kingdoms possesses their own ruler and its own Kirin, a divine creature which embodies the will of heaven and is entrusted to choose a kingdom's ruler by Tentei: Emperor of Heaven, and serves as the ruler's aide. The ruler will have immortal life as long as they keep the kingdom healthy and their heads are not severed from their body. If the ruler's Kirin dies or is killed, the ruler will die within a year.

The Koukai, known as the Yellow Sea, is surrounded by four inland seas: the Black Sea in the north, the Blue Sea to the east, the Red Sea in the south, and the White Sea to the west. Eight of the Twelve Kingdoms (Kei, En, Ryu, Kyou, Han, Sai, Sou, and Kou) border at least one of these four seas, extending from the center like the petals of a flower. The remaining four kingdoms (Tai, Hou, Ren, and Shun) are not part of the central mainland and are isolated by the Kyokai (虚海) (Void Sea) which surrounds the lands of the Twelve Kingdoms.

On May 11, 2006, U.S. publisher Tokyopop said in an interview with comic book news website Newsarama that it would be publishing the novels under its "Pop Fiction" imprint. The first book was released in March 2007.[10] The first four books have been released.

The anime adaptation by studio Pierrot aired from April 9, 2002, to August 30, 2003, in Japan on NHK for forty-five episodes. The opening theme is "Juunigenmukyoku" by Kunihiko Ryo while the ending theme is "Getsumei-Fuuei" by Mika Arisaka. The anime series has been released on DVD and Blu-ray in the United States by Media Blasters, which are now out of print. The license was transferred to Discotek Media, who released the complete series on Blu-ray in 2019.[11]

Kodansha printed a fifteen-volume "animanga" series in 2002–2004 by combining images from the anime series with printed dialogue and sound effects. It has been released only in Japanese.

Konami has released in Japan two games based on Twelve Kingdoms, both produced by Takashi Shimomichi. They are Juuni Kokuki: Guren no Shirube Koujin no Michi and Juuni Kokuki: Kakukakutaru Oudou Kouryoku no Uka. Both games contain footage from the anime and many stills of the characters are used during conversation and during battle. The games are sprite-based, with small sprites used on-screen and larger, highly animated sprites used during battle.

Juuni Kokuki: Guren no Shirube Koujin no Michi was released for PlayStation 2 on August 28, 2003. It follows Yoko's journey to becoming Empress of Kei. While classified as an RPG, it is often described as an adventure game. The game was re-released in Konami's The Best lineup on June 9, 2004. Yoko is capable of summoning Keiki's Shirei into battle as well as having additional party members.

Juuni Kokuki: Kakukakutaru Oudou Kouryoku no Uka was released for PlayStation 2 on April 4, 2004, and is a sequel to the first game, continuing with Yoko's problems after she becomes the monarch of Kei. Game data from the first game can be loaded into the second. This game contains more RPG elements than the first with party-/menu-based battles becoming standard. Many of the event scenes are pulled from the novels but there are also scenes made just for the game.