A “self-styled” 19-year-old who serves as Shu's partner at S&A Detective Agency. He actually manages the agency in place of Shu, who is never there. He's the ultimate handyman, taking care of the daily cooking, accounting, cleaning, and even walking the dog. He understands Shu better than anyone, and he serves as the conscience of the agency, trusted by assistants Ayaka and Manami as well.