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.
In contrast, the Demon Slayers are entirely human but employ specialized elemental breathing techniques known as "Breathing Styles". These techniques grant them superhuman strength, heightened abilities, and increased resilience that enable them to fight demons effectively. These include: Mist Breathing, Flame Breathing, Love Breathing, Insect Breathing, Wind Breathing, and Water Breathing. There is also a legendary, no-longer-used Breathing Style called Sun Breathing. The most formidable Demon Slayers are known as the "Hashira" and gain this title through multiple advancements in the Corps' ranks, culminating in killing fifty demons at the highest level or a member of the Twelve Kizuki.
