[1] Taguchi faced Yu Kimura in the tournament finals, held on October 15, 2011, and won the fight by a sixth-round technical knockout.
[2] Taguchi challenged the Japanese light-flyweight champion Masayuki Kuroda on March 12, 2012, at the Korakuen Hall in Tokyo, Japan.
Eakkasit failed to make weight for the bout and was accordingly banned from competing in Japan by the JBC for a period of one year, although he was still allowed to fight Taguchi.
[7] Taguchi returned to action four months after suffering his second professional loss, to face Ryan Bito on December 31, 2013, in a 49.5 kg catchweight bout.
[10] Taguchi was scheduled to challenge Alberto Rossel for the WBA light-flyweight title on December 31, 2014, at the Ota City General Gymnasium in Tokyo, Japan.
The bout presented Rossel's first title defense, after being promoted to status of undisputed champion following Kazuto Ioka's move up in weight.
[12] Taguchi made his first title defense against Kwanthai Sithmorseng on May 6, 2015, at the Ota City General Gymnasium in Tokyo, Japan.
[14] Taguchi was scheduled to make the second defense of his title against the #7 ranked WBA light-flyweight Luis de la Rosa on December 31, 2015, at the Ota City General Gymnasium in Tokyo, Japan.
Taguchi was scheduled to fight the #1 ranked WBA light-flyweight contender on August 31, 2016, at the Ota City General Gymnasium in Tokyo, Japan.
[18] Taguchi made his fifth title defense against the undefeated Carlos Cañizales, who was at the time the #3 ranked WBA light-flyweight contender, on December 31, 2016.
[20] Taguchi was scheduled to make his sixth title defense against Rober Barrera on July 23, 2017, at the Ota City General Gymnasium in Tokyo, Japan.