Doors of Chaos(グレンツェン・テューアGrenzen Tur, lit. German: Doors of the Border) is a manga written and illustrated by Ryoko Mitsuki. SoftBank Creative has released the manga's first tankōbon volume on June 30, 2008. As of August 2009, SoftBank Creative has released the third tankōbon volume on February 2, 2009. The manga is licensed in North America by Tokyopop. The manga is licensed in France by Soleil, in Hungary by Mangattack,, in Czech Republic as Dveře chaosu by Zoner Press and in Russia as Двери Хаоса by Eksmo & Comix-ART.