"With the loss of Folau for the rest of the year and moving up to the Premiership, Ere is a key acquisition to the squad," he said.
"Ere brings with him immense experience having been involved with the Crusaders set up since he left school and has a desire to play and compete each week having battled through his own injuries as a young man."
Enari will join his new teammates at the conclusion of the Trans-Tasman Super Rugby campaign.
The halfback said he's excited about the move North.
"It's exciting and I can't wait to contribute as much as I can to the foundation they've built so far and apply my trade," he said.
"I'm ready to compete, and I look forward to doing that alongside a great team with huge potential."
Hawke's Bay Rugby Union CEO Jay Campbell said Enari will add competition with local halfbacks and provide experience for Connor McLeod and Zach Donaldson to call upon as they compete for positions in the squad.