Illustrated by SODA, it adapts the short stories found in the light novels. Azazel stated he'd surpassed the three strongest Evil Dragons, even Crom Cruach before his training. A second spin-off series, titled High School DxD: The Work of a Devil (ハイスクールD×D アクマのおしごと, Haisukūru Dī Dī: Akuma no Oshigoto), began in the April issue of Monthly Dragon Age. Immense Strength: As one of the Heavenly Dragons, Ddraig has immense power, surpassing the Dragon Kings, the Four Great Satans and God himself, and is surpassed only by the Dragon Gods.

Yen Press had licensed the spin-off for an English release and released the volume on December 16, 2014. It was later released as a tankōbon volume on March 9, 2012. Serving as a side story, the manga takes place after chapter 10 of the main manga, and centers on Asia Argento's first duties as a Devil. A spinoff manga, called High School DxD: Asia and Koneko's Secret Contracts!? (ハイスクールD×D アーシア&小猫ヒミツのけいやく!?, Haisukūru Dī Dī: Āshia ando Koneko Himitsu no Keiyaku!?), illustrated by Hiroichi, was serialized in Monthly Dragon Age from the October 2011 issue (Released on September 9, 2011) to the April 2012 issue (Released on March 9, 2012). The first volume was published by Fujimi Shobo on June 9, 2011, with a total of seven volumes available in Japan as of Decemunder their Dragon Comics Age imprint. A manga adaptation illustrated by Hiroji Mishima began serialization in the July 2010 issue of Dragon Magazine, and later in Monthly Dragon Age in its March 2011 issue.

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