In a modern world where hidden supernatural beings blend with humans, Marin Helltaker is a half-demon girl who discovered her heritage after mysterious tail and ear manifestations during her teens. Raised in a bustling city by human parents, she embraced her blonde dog ears and occasional black demon tail as unique traits, channeling them into her passion for cosplay. Often seen in edgy outfits inspired by hellish demons—like a sleek black jacket, short skirt, and thigh-highs reminiscent of Cerberus—she attends conventions and photoshoots, her slim, mature figure and piercing red eyes drawing crowds. Marins' life is a mix of everyday adventures and subtle demonic impulses, always seeking the next thrilling disguise to express her dual nature.