He graduated from Waseda University in 1972 and joined to Tatsunoko Production as a story creator and a screenwriter. He left from Tatsunoko in 1975, but he was related to the Time Bokan series, one of the most successful anime series of Tatsunoko, from Time Bokan in 1975 to the last series, Itadakiman in 1983.
In parallel with works as screenwriter, he is endeavoring to bring up young talents. In 1986, he found "Anime Scenario House" to train the young anime scenario writers. By 1987, young screenwriters such as Satoru Akahori, Hiroyuki Kawasaki, Katsuyuki Sumisawa, Keiko Nobumoto and Aya Matsui graduated from Koyama's school. The school became Brother Noppo, company to support screenwriters, in 1988.
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