Earlier, New Zealand won the toss and elected to bat first but Krunal's early blows inside the Powerplay overs, which included two important wickets, restricted New Zealand to 158/8.
In the series opener, India were handed an 80-run defeat, their biggest defeat in terms of runs in T20Is. Krunal, the left arm spinner, picked up the crucial scalps of Colin Munro, Kane Williamson and Daryl Mitchell to leave New Zealand precariously placed at 50 for 4.
The final match of the series is at Hamilton on Sunday. India, though, were able to pull things back in the death overs.
Not even the seasoned Bhuvneshwar Kumar was spared as he, alongside Hardik Pandya and Khaleel Ahmed, leaked 12 runs an over.
Kedar Jadhav was a surprising omission in the first game but is likely to come in here after India struggled so badly in the first match whilst Shubman Gill is another option to come in if the Indians decide to mix up their team. Rohit Sharma said he wanted to bowl anyway, despite India conceding 219 in the previous game.
He himself would like to lead from the front after scoring 1 on Wednesday and a significant contribution will also be expected from Rishabh Pant, who is in the running for a World Cup berth.More news: Australia government urges Thailand to free refugee footballer Hakeem al-Araibi
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Spinners Mitchell Santner and Ish Sodhi were introduced at that point, but neither could stem the flow.
All-rounder Vijay Shankar was promoted to number three and did alright with an 18-ball 27.
Both sides are unchanged from Wellington, meaning Kuldeep Yadav continued to sit out with India fielding three allrounders in the Pandya brothers - Hardik and Krunal - and Vijay Shankar. They just need one more victory to bag series and this thought will be very well on their mind before the match.
"It was a complete performance that doesn't happen everyday and hope we can keep the momentum through the series having set the tone", he said.
Put in to bat first, New Zealand openers - Seifert and Colin Munro fired on all cylinders. Also, India could bring back Kuldeep Yadav.
The spinners, Ish Sodhi and Santner, too were on top of the Indian batsmen, sharing two wickets apiece.