Ouchi, as mentioned, debuted back in 2003 and despite struggling early in his career, falling to 3-2-1 (1) after 6 bouts, his career did manage to get going. In October 2010 he took on future world champion Ryoichi Taguchi and less than 2 years later he challenged the then Japanese champion Masayuki Kuroda.
His career had a slide in 2013 and 2014, with losses to Kenichi Horikawa and Atsushi Aburada, but rallied to score 4 straight wins and earn a shot at Ken Shiro in August 2016, though came up short to the talented youngster in a bout for the JBC and OPBF titles.
Following the loss to Ken Shiro it was revealed that Ouchi was suffering from a detached retina. Although he had surgery for the issue he was told that their was a high chance that the issue would return if he continued to fight, so instead he has chosen to retire.
Ouchi will take part in a retirement ceremony on March 19th as part of the "Big Fight Boxing Vol 48" card promoted by Himeji Kinoshita.