The 25-year-old Japanese is seeking his first professional win since joining the play-for-pay ranks in 2011 and knows he has to stay on top of his game despite taking the third round lead with his three-day total of four-under-par 209.
New Zealand’s Denzel Ieremia, who comes from a family of sporting stars, made his move by firing a flawless 66 to share second place with Micah Lauren Shin of the United States.
Shin lost grip of his overnight lead after marking his card with two birdies, one bogey and a double bogey for a 72.
Zimbabwean Scott Vincent meanwhile returned with a 68 to give himself another chance for his maiden breakthrough on the Asian Tour.
Vincent, together with Korea’s Y.E. Yang, and Japan’s Jinichiro Kozuma are bunched in fourth place, three shots back of Asaji.
The Asia-Pacific Diamond Cup is the Asian Tour’s first stop in Japan this season and second of four co-sanctioned events with the Japan Golf Tour Organisation (JGTO) this year.