Kogorou Hashiratani  

, 柱谷 小五郎

Uncle of Ryota is a brilliant researcher who worked as a doctor at a nearby college. Despite his exceptional intellect, he refused to use any form of transportation outside of the campus, causing him to decline all invitations from external sources. After witnessing the magic of a magician, Ryota requested that his uncle analyze the compound and create the medicine required for magicians. It was later discovered that both Uncle and Chisato were classmates at the same university.