Quick Scoop: Right now, Demon Slayer: Infinity Castle appears to be a theatrical-only release in the sources I found, with no confirmed streaming availability yet. The most reliable way to watch it is in cinemas, and ticketing pages or local theater listings are the best places to check for showtimes and availability.

Where it’s available

  • In theaters: Multiple sources say the movie is playing in cinemas, including select U.S. re-releases and international showings.
  • Streaming: JustWatch listings currently say no streaming offer is available yet.
  • Official/territory-specific updates: Aniplex’s official promotion also points viewers to theaters rather than a streaming service.

Best way to watch

  1. Check local cinema apps or ticket sites for showtimes.
  2. Look for special formats like SCREENX or premium screenings where available.
  1. For streaming updates, keep an eye on major anime platforms later, since none are confirmed yet.

A couple of notes

  • If you’re in India, one JustWatch page says tickets are available through BookMyShow and District by Zomato.
  • Avoid unofficial “free” sites; the sources that surfaced them are not reliable or safe.

TL;DR: Watch it in theaters for now; streaming hasn’t been confirmed yet.