Takeshi Obata
"Ral Ω Grad" is written by Tsuneo Takano and illustrated by Takeshi Obata. The series ran in Shueisha's "Weekly Shōnen Jump" from December 4, 2006 to July 9, 2007. Shueisha collected its 29 individual chapters into four "tankōbon" volumes, released from April 4 to November 2, 2007.