But Korea hit back with two quick tries of their own through Han Kun-kyu and Kim Jeep to close the gap to two points.
Korea’s forwards continued to cause Japan problems but Nakamura’s second and a further try from Noguchi, again converted by Ogura, gave them a sizeable cushion again.
After 32 minutes, Korea were reduced to 14 men when full-back Lee Jae Bok was sent to the sin-bin, and Japan capitalised to score through Usami. Ogura’s fifth conversion sent his side into the break 35-12 up.
Despite starting the second half short-handed, Korea clawed seven points back within 20 seconds of the restart when number eight Lee Yong Seung charged over for a converted try.
Scrum-half Shin Ki Cheol then dived over following some good work from his pack as the hosts closed to within 11 points.
Noguchi and Shintaro Ishihara ensured Japan would come away with the win, before Chang Yong Heung grabbed a consolation for Korea on the stroke of full-time.
It’s less than 10 days to go till the draw of the Rugby World Cup 2019…watch this space to find out which cities will be hosting the cream of world rugby.