Q.E.D. (manga)

Q.E.D.
First tankōbon volume cover, featuring Sou Touma (left) and Kana Mizuhara (right)
Q.E.D. 証明終了 (Kyūīdī Shōmei Shūryō)
Genre	Detective fiction[1]
Manga
Written by	Motohiro Katou
Published by	Kodansha
Magazine	Magazine Great (1997–2009) Magazine E-no (2009–2011) Monthly Shōnen Magazine+ [ja] (2011–2014)
Demographic	Shōnen
Original run	July 1997 – February 2014
Volumes	50
Television drama
Music by	Shōgo Kaida
Original network	NHK
Original run	January 8, 2009 – March 12, 2009
Episodes	10
Manga
Q.E.D. iff
Written by	Motohiro Katou
Published by	Kodansha
Magazine	Shōnen Magazine R (2015–2023) Getsu Maga Kichi (2023–present)
Demographic	Shōnen
Original run	April 20, 2015 – present
Volumes	25

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+ [ja] from July 1997 to February 2014, with its chapters collected in 50 tankōbon volumes. The series follow 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.

A ten-episode television drama adaptation was broadcast on NHK from January to March 2009. A manga sequel, Q.E.D. iff, started in Shōnen Magazine R in January 2015 and was transferred to Getsu Maga Kichi online manga platform in February 2023.

In 2009, Q.E.D. won the 33rd Kodansha Manga Award in the shōnen category.