After this unsatisfying attempt at college, studying Greek and then English, Sorayama's childhood affinity for drawing let him to Japan's Chuo Art School in 1967. Graduating in 1969, he was employed by the advertising firm Asahi Tsushin-sha in Tokyo as a comprehensive illustrator.

He began working independently as a free-lance illustrator in 1972.

In 1978 he started drawing robots, and a year later, these female figures began to surface publicly. While Sorayama's fine-tuned technique is superbly suitable for a wide range of subjects, his favourite remains the erotically charged form of a naked woman.

In 1994, he held his first one-man show in America at the Tamara Bane Gallery, California. A special Sorayama article appeared in the Silver Anniversary issue of Penthouse Magazine.

In 1995, he  designed a mechanical warrior in a science fiction movie Space Trucker. In the same year, he secured a long-term engagement to publish art monthly in Penthouse Magazine.

Sorayama resides with his wife and two daughters in Tokyo, Japan.

To quote Hajime Sorayama: