Having conceded 12 goals from two matches, the U-17 World Cup debutants showed fighting spirit against the East Asian powerhouse who were held to a frustrating 1-1 draw but still sealed a last-16 berth.
Wacalie said that his team was intimidated by the World Cup atmosphere earlier but showed warrior like spirit in their final group match here.
"But today they played with real passion, and showed what we are capable of. It was about looking into the eyes of the opposition and the boys did just that. The attitude they showed today was simply brilliant. NCL are warriors, who like to fight for their goals," Wacalie who took charge of the team in April after New Caledonia's historic qualification said.
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"The entire country was like paralysed in support of the team. I'm receiving messages from family and friends, it's really an overwhelming experience."
One of the nation's young brigade of coaches, Wacalie previously held the role of regional Technical Director in New Caledonia and he said he also doubles up as a general manager of the team.
Having made as many as nine changes to their starting line-up, Japan started off brilliantly with a seventh minute goal but only to survive a late scare from New Caledonia.
"We started well but after that players became timid and inactive like they have loads of pressure on their back," Moriyama said.
"With the new set of players we could not show our best on the pitch. The combination did not work and players became ineffective," he said.
Asked about his strategy in the match, Moriyama said: "I brought players who were eager and hungry and gave them chance instead of bringing in players who were tired.
"I hope to improve the quality and plug the loopholes before the next match," he said about their prequarterfinal here on October 17.
He also hailed New Caledonia's fighting spirit and said they deserved to return home with one point.
"I'm impressed by the excitement they showed. They played with a lot of courage, delivering the ball forward. Their performance was 180-degree different from their past outings," Moriyama said.