Tantei Opera Milky Holmes is a media franchise owned by the Japanese entertainment company Bushiroad. The first release was an Internet radio drama, released in December 2009. An anime adaptation by J.C.Staff aired between October and December 2010, with a special episode aired on August 26, 2011. The second anime season aired between January and March 2012 with another special aired on August 25, 2012. A third series, titled Futari wa Milky Holmes, aired between July and September 2013. A fourth series titled Tantei Kageki Milky Holmes TD aired between January and March 2015. Other media includes a manga adaptation serialized in Comp Ace between May 2010 and January 2011; two visual novels, released for the PlayStation Portable in December 2010 and August 2012 respectively; a trading card game tie-in with Bushiroad's Weiß Schwarz; and a light novel series published by ASCII Media Works under their Dengeki Bunko label.

Bushiroad Inc. is a Japanese entertainment company, producer of collectible card games and trading cards, publisher of mobile apps and games, promotional items and many other venues, which was founded in 2007 by Takaaki Kidani and is headquartered in Tokyo. Bushiroad created and owns various media franchises such as Tantei Opera Milky Holmes. Since 2019, Bushiroad is listed on the Tokyo Stock Exchange and has traded on the TSE since its launch on July 24, 2019.