Image via Amazon © Tsuytomu Nihei, Kodansha, Kodansha USAThe official X/Twitter account for manga creator Tsutomu Nihei 's editors announced on August 6 that Nihei's Tower Dungeon manga has over 1 million copies in circulation worldwide. Kodansha published the manga's sixth compiled book volume on March 9. Kodansha USA Publishing licensed the manga and published the manga's fifth volume in English on May 5. Kodansha USA describes the manga:An evil sorcerer slays the king and takes over his body, kidnapping the princess and spiriting her away to the legendary Dragon Tower. The manga had a promotional video on March 31 that featured animated clips by studio keel .