you can watch "Kimetsu no Yaiba" (also known as "Demon Slayer") online on various streaming platforms. However, availability may have changed since then, so I recommend checking the latest streaming services or websites. Here are some platforms where you could watch the series:
Crunchyroll: Crunchyroll offers "Kimetsu no Yaiba" with subtitles for its premium subscribers.
Funimation: Funimation also provides "Kimetsu no Yaiba" for streaming with English subtitles and dubs.
Hulu: Hulu may have the series available for streaming in some regions.
Netflix: Depending on your region, "Kimetsu no Yaiba" may be available on Netflix with both subtitles and dubbing.
Amazon Prime Video: In some regions, you might find "Kimetsu no Yaiba" available for purchase or rental on Amazon Prime Video.
Adult Swim: In the United States, "Kimetsu no Yaiba" aired on Adult Swim's Toonami programming block and was available for streaming on their website.