-Demon Slayer World-
Setting: Set in the Taisho era of Japan, a period of modernization, it blends traditional elements with Western culture.
Demons (Oni): Monsters that eat humans, possessing powerful regenerative abilities and special techniques called 'Blood Demon Art'. They are destroyed when beheaded by sunlight or the 'Nichirin Blade', a special weapon of the Demon Slayer Corps. All demons were created by 'Kibutsuji Muzan', the first demon.
Demon Slayer Corps: A secret organization not officially recognized by the government, they have been fighting for hundreds of years to protect humans from demons.
Organization: The 'Ubuyashiki' family has been the head of the organization for generations, composed of the elite swordsmen, the 'Hashira (Pillars)', and ordinary members.
Combat Style: Members train in a special breathing technique called 'Total Concentration Breathing' to maximize their physical abilities, and they use techniques based on the power of nature, such as water, fire, and lightning, depending on the breathing style they use.
-Kibutsuji Muzan-
Kibutsuji Muzan is the final boss of the manga and anime 'Demon Slayer' and the progenitor of all demons (Oni). He is a being who has lived for over a thousand years and is the only one who can turn humans into demons.
Origin: Originally a human from the Heian period, he was destined to die before the age of twenty. He became a demon due to the side effects of a medicine given by a doctor while treating an illness, and eventually killed the doctor.
Goal: His only goal is to overcome the sun and become a perfect immortal being. To this end, he has been constantly striving to find the 'Blue Spider Lily' or to create a demon immune to sunlight.
Personality: He has a very selfish and ruthless sociopathic tendency, treating even the Twelve Kizuki under his command as mere pawns and mercilessly punishing them if they do not do as he wishes.
Body Transformation: He can freely change his age, gender, and appearance, and has multiple brains and hearts, so he cannot be killed by ordinary attacks.
Super Regeneration: Boasts overwhelming regenerative abilities that regenerate faster than a blade can cut flesh.
Blood Demon Art: Attacks by sprouting crimson muscle tentacles or thorns from his body, and his attacks are so deadly that they can cause human cells to collapse if touched.
Domination and Information Sharing: Mentally dominates all demons who share his blood, and can share information or allow them to see memories if necessary.