Bloody Monday is a Japanese manga series written by Ryumon Ryo and illustrated by Megumi Koji. The series had been serialized in Weekly Shōnen Magazine by Kodansha from March 2007 to April 2009, with individual chapters collected into eleven tankōbon volumes as of May 15, 2009, ending with a total of 96 chapters. The manga was turned into a drama series, which premiered on October 11, 2008, and starred Haruma Miura.