In Taishō era Japan, a secret organization known as the "Demon Slayer Corps" has waged a war against demons for centuries. Demons are former humans who possess supernatural abilities such as enhanced strength, rapid regeneration, and unique powers referred to as "Blood Demon Arts". Demons can only be killed if they are exposed to direct sunlight, decapitated with weapons crafted from an alloy called Nichirin, or injected with a poison extracted from wisteria flowers