The High Speed! -Free! Starting Days- film is directly inspired by the High Speed! novel that was loosely adapted into the original Free! television anime.
The event commemorating the Blu-ray and DVD release of the High Speed! -Free! Starting Days- film announced a “new screen project” is in the works for the Free! franchise.
Kyoto Animation’s first Free! anime about the Iwatobi High School Swim Club premiered in July 2013, and Crunchyroll streamed the anime as it aired in Japan.
Whereas the Free! anime centers on Haruka and the other swimmers during high school, High Speed! followed them during middle school.