They've won all but one of their HSBC Sevens Series tournaments so far this season, look set to win the overall series and have already qualified for the 2020 Olympics - but the hunger the Black Ferns Sevens have to succeed for their country won't be filled until the end.
Black Ferns Sevens comfortable heading into world series finale in France
In her career, Hirini has managed to avoid injury and only missed two tournaments. Representing New Zealand means a lot to the 26-year-old, who has achieved so much.
"I suppose it's with a little bit of luck, which has been nice but I suppose I just put a lot of effort on my preparation, and making sure that I do everything right when I'm at home ... I suppose it helps me stay on the training pitch.
"My goal is just to put my hand up to try and make that team. Wearing the black jersey is a huge honour and I don't ever want to, one, take it for granted but I don't want to miss out either. It's always just about trying to make that tournament and then doing as best that I can when I'm wearing that jersey."
Hirini is sitting on 195 caps and should everything go as planned for the captain and her squad, she looks likely to become the first female player to reach the milestone of 200 caps in France next weekend.
She says training was "pretty crazy out there" yesterday but the whole team was looking forward to their last-minute preparations to achieve the goals they had set for themselves.
Assistant coach Cory Sweeney said the team was focused on a strong finish to their already successful season.
"[Hirini] is a great leader and person who has played a lot of sevens, the potential to bring up a big milestone in France is exciting for her and the team," Sweeney says.
In Pool A, New Zealand will face England, Russia and invitational side Scotland. Pool B will see third-placed Canada line up against fourth-placed Australia, Spain and Ireland, while in Pool C hosts France will battle it out against second-placed USA, Fiji and China.
"We're five tournaments down with one to go and it's really exciting to be in the position we are. We control our destiny at this tournament, we've worked really hard to get to this point so we are going to France to win, and if we do that, we will secure the series title which would be an amazing bonus."
After a mid-season injury crisis the team is almost back to full strength, with Theresa Fitzpatrick returning for the Biarritz tournament.
"It's been a tough few months injury wise but the last few weeks we've had 18 or 19 players on the field which is amazing and most of them were available for selection."
The travelling Black Ferns Sevens squad:
Shakira Baker
Michaela Blyde
Kelly Brazier
Dhys Faleafaga
Theresa Fitzpatrick
Sarah Hirini (captain)
Tyla Nathan-Wong
Cheyelle Robins-Reti
Alena Saili
Terina Te Tamaki
Ruby Tui
Niall Williams
Tenika Willison
Black Ferns Sevens' Biarritz Sevens fixtures:
New Zealand vs Scotland: June 15 at 11.36pm.
New Zealand vs Russia: June 16 at 2.20am.
New Zealand vs England: June 16 at 5.04am.