It was serialized by Shueisha in the manga magazine Weekly Shōnen Jump between issues 3 and 14 of 2007, and collected in a single bound volume (tankōbon).
Weekly Shōnen Jump, a Japanese manga anthology magazine published by Shueisha since 1968
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The company was founded on June 4, 2000, by former Weekly Shōnen Jump editor-in-chief Nobuhiko Horie (who currently serves as the company's CEO), along with manga artists Tsukasa Hojo, Tetsuo Hara, and Ryuji Tsugihara, and voice actor Akira Kamiya, among others.
In 2003, Hideaki Sorachi was an up-and-coming manga artist who had already created two one-shots for the Weekly Shōnen Jump magazine.
In a May 2, 2007, letter, Shueisha announced that Claymore takes a month break but it, Gag Manga Biyori, Rosario + Vampire, and Tegami Bachi continued in Weekly Shōnen Jump until the start of the magazine Jump SQ.
Kyosuke Usuta, prominent manga writer well known for working in the anthology Weekly Shonen Jump
Monthly Shōnen Jump, a former sister publication of Weekly Shōnen Jump, published from 1970 to 2007
Ansatsu Kyōshitsu (暗殺教室, lit. "Assassination Classroom") (2012-ongoing, Weekly Shōnen Jump)