Adam Griggs’ side were on the cusp of a winning start to their international season when Ellen Murphy kicked a penalty with six minutes remaining to put here side 13-10 up.
Ireland had created some daylight through tries from Linda Djougang and Enya Breen, before Wales responded with 10 unanswered points.
The hosts still looked like they would hold on for just their second success of 2019, until replacement scrum-half Bevan went over to seal a narrow win for Wales.
In a country where rugby is king, high schools are breeding grounds for future rugby talent that the sporting world acknowledges to be the most plentiful on the planet.
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