武蔵野市
Tanaka was born in Musashino, Tokyo, and moved to Nagano at the age of 8 when his father became a professor at Shinshu University. He initially failed the university entrance exams in 1975 and spent the next year studying in Tokyo to retake them. In 1976 he entered the Faculty of Law at Hitotsubashi University. He received the Bungei Prize in 1980 for his first novel, "Nantonaku, Crystal Feeling", while still a student. He graduated in the same year and briefly worked for the Mobil Oil Corporation for three months before leaving to continue his career as a writer. Tanaka married after graduating from university but divorced 11 months later.