In 1956, Otsuka saw an advertisement in the
Yomiuri Shimbun where Toei was soliciting job applications for animators. After passing the test, Otsuka worked with
Yasuji Mori and Akira Daikubara on
The Tale of the White Serpent and learnt their approaches. Wanting to learn more animation theory, he began to seek out textbooks and was shown a textbook on US animation written by
Preston Blair. After working on
Magic Boy in 1959, his animation of a skeleton was unintentionally considered comical due to its realism. This led to comical
bad guy characters becoming Otsuka's specialty. He came to believe that genuine realism doesn't suit animation and "constructed realism" is more suitable.
Hayao Miyazaki compared Otsuka to
Kenichi Enomoto in the use of this approach. After completion of his next film, ''
The Wonderful World of Puss 'n Boots'', Otsuka left Toei to join
A Production. Otsuka has written several books about the anime industry. His '''' is considered "a prime resource for the history of 1960s and 1970s anime". In July 2002, an exhibition of his work and personal pieces was held in
Ginza. ==Works==