Yasuo Ōtsuka(大塚康生Ōtsuka Yasuo) (born July 11, 1931, in Shimane Prefecture) is a Japanese animator who worked with Toei Animation and Studio Ghibli. Prior to becoming an animator, Ōtsuka worked in the Kantō-Kōshin'etsu district drug enforcement office at the Ministry of Health and Welfare. As a member of the support staff (a so-called "Drug G-man"), he was responsible for the seizure of drugs and was required to operate and maintain a handgun. During his tenure as a Drug G-man, Ōtsuka would see the release of two types of firearms that later would show up in his animations: the Beretta and the Colt Government - both appearing in the Lupin III series (the former used by Fujiko Mine and the latter by Inspector Zenigata).