Flemings' basket with 3:43 remaining in overtime made it 56-55 and gave the Rainbow Warriors (1-2) the lead for good. The Bengals (1-1) pulled to 60-59 on Amorrow Morgan's two free throws with 1:09 left, but Kareem Nitoto and Amis each made two free throws for Hawaii to make it 64-59 with 7.5 seconds left.
After both teams traded free throws, Morgan hit a 3-pointer to cut the lead to 66-64 with 1 second left. But Adhar Mayen made a free throw for Hawaii and Amis intercepted Idaho State's inbound pass as time expired.
Morgan led Idaho State with 26 points and Demetrius Monroe added 14.
The game was part of ESPN's College Hoops Tip-off Marathon and started at 11 p.m. local time.
Former Kentucky guard Ed Davender, the only Wildcat with at least 1,500 points and 400 assists, has died. He was 49.
Guard Naz Mitrou-Long, whose 2015-16 season ended in December due to hip problems, has been granted a hardship waiver for the coming season, Iowa State said.
As the Sooners look to life without superstar Buddy Hield and his sidekicks, it's clear their unseasoned players will need to grow up fast.