Oguni Gensai is a skilled elderly physician who owns and runs a modest clinic in downtown Tokyo near the Kamiya dojo. A longtime friend of the Kamiya family, the good doctor is frequently called in when a member or ally of the Kenshin-gumi is in need of medical aid. In the anime series, Gensai is most often seen in the company of his two young granddaughters, Ayame and Suzume.