Osamu Kikuchida is a supporting character in the anime film Whoever Steals This Book. He is a physical education teacher at the high school attended by the protagonist, Mifuyu Mikura, and he is known by the nickname Sansho. He is characterized as a somewhat overbearing and eccentric person with a hot-blooded, intense disposition. His role in the story is that of a school teacher connected to the everyday setting around the main character, and the available character information presents him as a minor presence rather than a figure directly involved in the central events concerning the stolen books and the book curse.