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)
GenreDetective
Manga
Written byMotohiro Katou
Published byKodansha
Magazine
  • Magazine Great (1997–2009)
  • Magazine E-no (2009–2011)
  • Monthly Shōnen Magazine+ (2011–2014)
Original runJuly 1997February 2014
Volumes50
Television drama
Music byShōgo Kaida
Original networkNHK General TV
Original run January 8, 2009 March 12, 2009
Episodes10
Manga
Q.E.D. iff
Written byMotohiro Katou
Published byKodansha
Magazine
  • Shōnen Magazine R (2015–2023)
  • Monthly Maga Kichi (2023–2025)
Original runApril 20, 2015February 11, 2025
Volumes30
Manga
Q.E.D. Univ.
Written byMotohiro Katou
Published byKodansha
MagazineMonthly Maga Kichi
Original runMarch 4, 2025 – present
Volumes2

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 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 Monthly Maga Kichi online manga platform in February 2023, where it finished in February 2025, and a third series, Q.E.D. Univ., started on Monthly Maga Kichi in March of the same year.

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