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In 1976, he graduated from Tokyo Gakugei University. The following year, he entered Tatsunoko Productions and worked on his first anime as a storyboard artist on "Ippatsu Kanta-kun". During this period at Tatsunoko, Oshii worked on many anime as a storyboard artist, most of which were part of the "Time Bokan" television series. In 1980, he moved to Studio Pierrot under the supervision of his mentor, Hisayuki Toriumi.