Cape Town - Japan claimed a 33-21 win over Romania in their first Test of their June campaign at Egao Kenko Stadium, Kumamoto on Saturday.
Tries from Akihito Yamada, Kenki Fukuoka and Michael Leitch saw them to the success, with Jumpei Ogura kicking 18 points from the tee.
In reply Mihai Macovei scored twice for Romania in defeat.
Japan led 23-9 at the interval after an impressive 40 minutes that saw them cross twice while limiting the Romanians to only penalty goals.
Vlaicu added two penalties to make it 0-6 but the Brave Blossoms hit back with scores from Yamada and Fukuoka with Ogura kicking well.
The first score of the second-half was always going to be crucial and it went the way of the home side when Leitch crossed two minutes in. That made it 30-9 with the extras to leave Romania a mountain to climb as changes began to be made from both head coaches in Kumamoto.
Romania would strike next though through captain Macovei and with Heiichiro Ito yellow carded on 63 minutes, the visitors sensed a chance.
Macovei scored again on 66 minutes and with Vlaicu's conversion the Romanians were now just 33-21 behind, setting up an intriguing finish.
But Japan would hold on to start their June Test campaign on a positive note.