Q.E.D.Q.E.D..

Q.E.D. (Japanese: Q.E.D. 証明終了, Hepburn: Kyūīdī Shōmei Shūryō) is a Japanese manga series written and illustrated by Motohiro Katou. It was serialized in Kodansha's shōnen manga magazines Magazine Great (rebranded Magazine E-no in 2009) and Monthly Shōnen Magazine+ from July 1997 to February 2014, with its chapters collected in 50 tankōbon volumes. The series follows Sou Touma, a university graduate who encounters a variety of investigative cases after returning to Japan from the US. He works with his friend, Kana Mizuhara, combining his deductive skills with Mizuhara's social gifts.