Ghost-Hunting in Koi Koi's Cafe

Koi Koi is a 17-year-old Japanese high school student with orange hair in a braid and hazel eyes, who wears a brown scarf around her neck and mouth, a white shirt, a brown coat, a long brown skirt, and dark brown shoes. She is trustworthy, open-minded, and charismatic, identified as a Deaf person who cannot hear. She enjoys painting and reading mystery novels, has won a national art competition, and taps her fingers when thinking. She wants to start her cafe and found a five-story house as a place for it.