Yasuharu Takanashi
A fourth season of the series, called , was announced. Produced by TNK and ARMS, the series is directed and written by Koichi Ohata, music by Yasuharu Takanashi, characters by Rin Shin and Junji Goto, and produced by Hiromasa Minami, Hisato Usui, Keisuke Kawai, Shinsaku Tanaka, and Takuro Hatakeyama. The series introduces two new schools, Nanban High School and Ryoshu Academy, the latter of which was the original school from the one-shot pilot chapter of the manga series, and introduces Kentei, the Japanese equivalent of Emperor Xian, as an antagonist. The series aired twelve episodes on AT-X between March 26 and June 11, 2010, with subsequent broadcasts on Chiba TV, TVK, TV Saitama, Tokyo MX, TV Aichi, and Sun Television. Six DVD and Blu-ray volumes were released by Media Factory between June 25 and November 25, 2010. The DVD/BDs contains an original video animation called . "Xtreme Xecutor" is licensed in North America by Funimation Entertainment, as with the first and third seasons.