Asada reached the last 16 of the 2014 World Masters in Hull and beat Darryl Fitton in the first round before losing to Mark McGeeney.
He qualified for the 2015 BDO World Darts Championship, losing to Brian Dawson in the preliminary round.
Asada qualified for the 2016 BDO World Darts Championship, beating Darius Labanauskas 3–1 in the preliminary round.
In 2017, Asada won the Japanese Championship, organised by the PDJ (Professional Darts Japan).
On 26 November, he was drawn for a preliminary round game at the World Championship against Australian Gordon Mathers, whom he defeated 2–1, but was then eliminated 0–3 by eventual tournament winner Rob Cross.