[2] Ono played alongside future All Blacks Owen Franks and Colin Slade as part of the 2004 squad that went unbeaten.
But then after the tournament Ono was not selected by coach John Kirwan who preferred James Arlidge and Shaun Webb at fly half.
In 2012 Ono was named in the Top League team of the season [5] and was brought back into the team by new coach Eddie Jones after four-and-a-half years since his last cap and established himself as first choice fly half and as yet has only missed one international game since Jones took charge.
Notably in November 2012, Ono made important contributions on Japan's successful tour of Eastern Europe with a great tactical kicking performance in Romania[6] and then the following week he scored a last minute winning drop goal against Georgia.
[7] For the 2012–13 Top League season he moved from the Fukuoka Sanix Blues to the reigning champions Suntory Sungoliath forming a half back combination alongside former Springbok Fourie du Preez and helped them to retain their title and go the season unbeaten.