"They played with speed, agility and controlled aggression - the attributes of many a strong sevens team," said organiser Thomas Te Pou.
Te Pou said about 70 girls took part but he was hoping three more schools would join next year to form two pools of four, culminating in semifinals and final.
Hawke's Bay Rugby Football Union development officers and sevens selectors gave the day a boost with their attendance.
Te Pou thanked Hastings Boys' High School for providing referees and Irongate School for marking the grounds and helping create an inspiring environment for the girls taking part.