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 [url=https://tvtropes.org/pmwiki/pmwiki.php/Characters/MAMIYA]TV Tropes[/url]] [spoiler]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.[/spoiler]