有栖川

Children's book writer. A man of both arrogance and caring who loves drinking, smoking, and reading. He and Samejima fight like cats and dogs. His Mamiya used to proofread his writings. [From TV Tropes] His real name is Arisugawa Osamu (有栖川 治). He was Kikuchi Ryou's mother's boyfriend in the past, and the father of Midori.