Junior Japan came out on top in an 11-try extravaganza of attacking rugby to finish second in the table overall.
Junior Japan beat Tonga A with a score of 42-33.
Tonga A blitzed their way into a 12-0 lead inside the first eight minutes thanks to a brace of tries from centre Paki Afu, the second converted by full-back James Faiva.
Stung into action, Junior Japan responded with a three-try salvo in a 10-minute period between the 17th and 27th minute, number eight Fuala Makisi crossing twice either side of a score for captain and hooker Kosuke Horikoshi. Scrum-half Naoto Saito was on the mark with all three conversions to make the score 21-12.
Tonga were next to cross the whitewash through openside Frederick Kei, but centre Shogo Nakano ensured Junior Japan had the final word of the first half by scoring their bonus-point try just before the interval.
It took 14 minutes of the second half before the next scoring play, Nakano crossing for his second of the match only for Samoa A to cancel out the seven points through a converted try of their own, number eight Topui Sekona supplying the finish on this occasion.
When hooker and Captain Sione Lolohea added to the brace he scored in the opening round defeat to Fiji Warriors, Tonga were back to within two points of their opponents at 33-35 with 14 minutes to go.
However, Junior Japan closed the game out shortly afterwards when Makasi completed his hat-trick and Saito added the extras.
“We worked hard for the whole 80 minutes and every player enjoyed the game and that’s the reason we won,” said Junior Japan captain Kosuke Horikoshi.
“Although we came to win the tournament, to finish runners-up is a good result as we’ve never finished that high before.”