Kuroko's Basketball
After the anime began airing in 2012, the series became popular with "dōjinshi" circles, particularly for "yaoi dōjinshi", though there is no yaoi content in the series itself. Several events at which dōjinshi of the series were to be sold, as well as several other locations linked to the series and the author Tadatoshi Fujimaki, including a television station airing the anime, a convenience store chain selling items of the series, and Fujimaki's alma mater Sophia University, received threatening letters containing a powder or liquid substance. It is still unknown if it is one individual behind all the threatening letters, nor is the reason for the threats known. Multiple doujinshi events, including Comiket, banned content related to the series, barring creators from selling "Kuroko's Basketball"-themed doujinshi at their events. The suspect, who was later revealed to be a 36-year-old man named Hirofumi Watanabe, was eventually caught and was arrested on December 15, 2013. Due to the loss of "Kuroko's Basketball" dōjinshi because of the threats, there was a special event that specifically focused on dōjinshi related to the series affectionately named "Kuroket", organized by the Comic Market Preparatory Committee, held during the Comiket Special 6 – Otaku Summit 2015 on March 29, 2015. The event hosted approx. 2400 "dōjinshi" circles.