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The Japanese player began the week at Woo Jeong Hills Country Club in 106th on the Race to Dubai Rankings delivered by DP World, with the top 100 after the event earning their playing rights for next season.
However, Katsuragawa blitzed the field on Moving Day as he matched the course record of 63 to open up a two-shot advantage heading into final round.
He could not get his Sunday going as he carded just one birdie, at the fourth, but minimised blots on his scorecard with 16 pars before a closing bogey for a total of 13 under.
It mattered not as he earned a two-shot victory over French duo Frederic Lacroix and Martin Couvra, who sealed their places in the playoffs with a share of second.