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Yamada graduated from the Department of Literature at Keio University. While attending the university he was in the same year as the Macross character designer [Haruhiko Mikimoto](https://anilist.co/staff/96968/) and creator [Shouji Kawamori](https://anilist.co/staff/97501/), both of which where the first people he collaborated with in [The Super Dimension Fortress Macross](https://anilist.co/anime/1088//). This marked the start of his scriptwriting career.