He was born in Tokyo Setagaya Ward SDF Central Hospital to Kinue and Kenichi Ozaki. He had one older brother, Yasushi. Early in life, he was hospitalized with intestinal torsion and bronchitis which subsequently weakened his internal organs. In 1973 he began studying martial arts and continued training throughout his life. In January 1975 he began playing piano and in March of that year, he wrote his first poem. His first live performance was in 1978 at his school's cultural festival. He was discovered by producer Akira Sudo and signed to CBS Sony in 1983.