How many seasons does the Demon Slayer anime have?

How to get close to this number

Four again, and for the same reason as the other completed adaptation on this site: a manga of moderate length adapted across several years of quarterly cours produces about that many. The broadcast grid does most of the work in any anime season-count question.

The interesting part is what replaced the fifth season: the final arc is being told as a trilogy of feature films rather than as television. That is a commercial decision — theatrical anime has become extraordinarily profitable — and it means the story concludes in cinemas rather than on a broadcast schedule.

That shift matters for how these questions age. A franchise can be complete as a story while having a season count that stops short of it, because the ending exists in a different format. Counting seasons increasingly undercounts the work, and the boundary between television and film is dissolving from both directions at once.