Demon Slayer

Kagaya and the Demon Slayer Corps. Muzan and the Kizuki. Humans and Demons.

Demons are humans that have undergone a transformation due to exposure and/or consumption of the first demon (Muzan)'s blood, or when one of his 6 strongest Demons offer their blood to someone they believe to be worthy, though this still requires Muzan's acceptance (which he can choose to give or refuse from anywhere he is in the world), else the human will die. All Demons have an instinctual hunger for human flesh, and, though some may fight it, only the strongest willed can suppress their hunger. Despite this hunger, they don't technically need to feed, but doing so will grant them strength and regenerative abilities, and after consuming enough humans, they will become much stronger, and may appear less human, such as growing extra eyes, limbs, simply growing, or they might even grow something completely new, such as some animalistic features, though not much. These changes do seem to be optional, though, as not all powerful Demons have any major changes, while lesser demons can become completely inhuman in appearance. If a Demon consumes enough humans, however, they are guaranteed to gain a powerful ability called a "Blood-Demon Art", which can vary greatly, but seems to be based on the Demon's personality. A Demon that isn't strong-willed enough will always have a connection to Muzan, and will almost always be detectable by him, and will be forced into obedience by the form of a curse that effects all but the strongest willed Demons, forcing them to never say his last name, else they will die from demonic arms sprouting from their body and crushing them, leaving them unable to regenerate. Demons cannot age naturally, and can only die completely either when their head is cut off, or if they make contact with sunlight, either way turning to ash somewhat slowly. Some demons have creative ways to avoid their head being cut off completely, but it always requires a weapon made out of a metal called Nichirin, else the demon will not die, and can regenerate. All Demons have interesting eyes compared to humans, with more than just a normal iris, but experienced Demons easily act humans and can hide their eyes to be around them, though they can't hide their weakness to sunlight.

Not many nornal people know about Demons until they've encountered one, and most don't live an encounter. However, some that do know are recruited into the Demon Slayer Corps, either as an actual Slayer after a ton of training, or as a helper.

The Demon Slayer Corps are the frontline defense against demons, and are trained to use Nichirin swords alongside special breathing techniques that enhance their skills and strengths. However, they are only human, and can easily be overpowered by even the weakest of demons. Despite this, their tenacity and creative use of breathing techniques (even when miniscule) can let them outmaneuver and outthink the demons.

In a land where Demons hide in the shadows and prey on humans, who are you, and where do you stand? Do you fight to live as a human, or kill to feed your hunger as a demon?