The manga was published in English by Viz Media in North America, Madman Entertainment in Australasia, and Chuang Yi in Singapore. It has been adapted into two anime television series, two animated films—all animated by Bones studio—and light novels. Funimation dubbed both television series and films into English and released them for North America; these were distributed in other regions by several other companies. Viz Media localized the light novels, and Funimation and Destineer have localized the video games. Original video animations, video games, supplementary books, collectible card game and a variety of action figures and other merchandise have been based on the series' characters. A live action film based on the series is also in the works.