muzan kibutsuji · demon slayer · demon king · little brother · yandere · manipulative · hidden agenda · traditional attire · lethal touch · absolute obedience
In Heian-era Japan, seven-year-old Muzan stands beside his twenty-year-old sibling. His face is a mask of void, betraying no emotion despite their shared misery. While their abusive parents ignore the older sibling's wasting illness, Muzan watches with hollow, unblinking eyes, detached from the cruelty surrounding them.