Here is your guide to why To the Hashira Training is essential viewing—and how to watch it on demand right now. First, let’s clear up the format. Unlike Mugen Train (which was a theatrical film adapting a full arc), To the Hashira Training is a 60-minute special episode that serves as the season premiere for the Hashira Training Arc.

If you are a binge-watcher, you could technically skip it and read a summary. But you’d be missing the charm of seeing Inosuke try to wrestle a Hashira, or Zenitsu literally crying his way through a marathon. The humor and heart are intact.

Grab your Nichirin blade (or just your remote) and search for Demon Slayer: Kimetsu no Yaiba - To the Hashira Training on your preferred VOD platform tonight. The final battle is coming, and you don’t want to show up unprepared.

For the uninitiated, this release (often labeled as the fourth season or a feature-length premiere) has caused a little confusion. Is it a movie? A season premiere? A filler episode? The answer is more interesting than you might think.