The episodes of the 2008 Japanese anime series Nabari no Ou (隠の王?, lit. King of Nabari) are directed by Kunihisa Sugishima and animated by J.C.Staff. The anime is an adaptation of Yuhki Kamatani's Nabari no Ou manga, which was first serialized in the Japanese shōnen manga magazine Monthly GFantasy in 2004. The story revolves around Rokujo Miharu, a 14-year-old student who unknowingly possesses a powerful hijutsu within him, and his introduction into the hidden ninja world of Nabari upon his power's activation.
It first began airing on Japan's terrestrial television network TV Tokyo on April 6, 2008; airing on Sundays from 01:30 to 02:00 (JST). It also aired on other Japanese networks such as TV Aichi and TV Osaka, though it aired first on TV Tokyo. It contains a total of twenty-six episodes.
On August 19, 2008 Funimation, on the behalf of d-rights, sent cease and desist orders to the fansub groups who were subtitling the series, to prevent copyright infringement. On December 25, 2008, Funimation announced they licensed the series for an English language release.
Three pieces of theme music are used for the episodes: one opening theme and two ending themes. The opening theme is "Crawl", performed and arranged by Veltpunch, with the lyrics and composition by Hidenori Naganuma. The ending theme up to the sixteenth episode is "Hikari" by Elisa, with lyrics by Emi Nishida. From the sixteenth episode to the end, "Aru ga Mama" (あるがまま "As It Is"?) by Anamu & Maki is used. Veltpunch and Elisa released the singles for "Crawl" and "Hikari" on May 21, 2008 and Anamu & Maki released the single for "Aru ga Mama" on September 3, 2008.