Demon Slayer started as a manga and was later adapted into an anime.

Quick Scoop – Key Dates

  • The Demon Slayer: Kimetsu no Yaiba manga by Koyoharu Gotouge was first serialized in Weekly Shōnen Jump in 2016.
  • The TV anime adaptation by ufotable began airing in 2019 , which is when the series “blew up” globally.

So if you’re asking “when was Demon Slayer made”:

  • As a manga : made and launched in 2016.
  • As an anime : produced and released starting in 2019.

In simple terms: the story was created and published as manga in 2016, then turned into the famous anime a few years later in 2019.

TL;DR: Demon Slayer was made as a manga in 2016 and as an anime in 2019.

Information gathered from public forums or data available on the internet and portrayed here.