The protagonist in Oreki Houtarou's mystery novel Classic Series and animation work Bingguo. He has excellent insight and reasoning ability, and he is also a person who pursues more than one thing. I'm not interested in the community activities on campus, but I joined the Ancient Books Research Association with the strong recommendation of OG sister Oreki Tomoe from the Classical Department of Shenshan High School. Chitanda Eru took a fancy to his insight and reasoning ability, and naturally took up the post of detective.