[1] He made his first international appearance on 22 December 1980 in a 1982 World Cup qualification against Singapore in Hong Kong.

He scored his first international goal on 20 September 1986 in an Asian Games match against Nepal in Daejeon, South Korea.

However, he could not play any game in the competition that was centrally held in Doha, Qatar as his recovery wasn't as good as Ooft had wished it to be.

The Japanese fans now refer to this match as the Agony of Doha, and his absence was one of the main reasons why Japan's campaign ended up unsuccessful.

After finishing his playing career, Tsunami worked as a pundit on television and as a coach at Tokyo Verdy's youth setup.

In 2007, he became the manager of newly relegated J2 side Cerezo Osaka but was dismissed in May after a bad start.

In 2008, he was appointed as the manager of J2 League club Yokohama FC but was fired at the end of the 2008 season.