User summary:
Kancolle (艦これ) is an apocryphal fan-translation of the commercially-published Japanese-language game Kantai Collection (艦隊これくしょん).
The original concept was presented as a free-to-play web browser game in 2013, subsequently the game has developed into a much larger media franchise; various media including multiple manga series, light novels, and video games have been released, in addition to an officially licensed tabletop role-playing game, released in 2014 with additional supplements in 2015.