"I'm loving it, every moment, learning from the likes of DJ Forbes and Scott Curry," says Koroi.
"I was pretty stoked when I got the call-up to come into camp (in Rotorua) so I thought I would give it a try and ended up making it down to Wellington. The Condors and the Worlds were really good in getting me prepped for this level."
New Zealand coach Scott Waldrom is excited by Koroi's potential, having watched him star at last month's premier schools sevens events.
"I guess what Vili brings to the team is what New Zealand have not had since Tomasi Cama stopped playing. That is, a playmaker, and the Fijian flair that guys in the past have brought to the team. He brings that ability to attack from nowhere and create space for other players."
The other rookies are the Tasman trio of Andrew Knewstubb, Tone Ng Shiu and Trael Joass. The latter has featured for the Makos, but the former duo are virtually out of club rugby, proving you can make it in sevens without starring in 15s.
Koroi needs to make the final squad cut of 12 to take the field this weekend.