Shion no Ō, subtitled The Flowers of Hard Blood, is a Japanese mystery manga written by Masaru Katori and illustrated by Jiro Ando. It is published by Kodansha in the seinen manga magazine Afternoon, and is collected in eight bound volumes. It has been adapted as a twenty-two episode anime television series by Studio Deen, which aired in Japan between October 2007 and March 2008. A video game for the Nintendo DS was released on April 10, 2008 by Mainichi Communications.

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