Onerahi, batting first, batted sedately for the first 36 overs of the match. They barely went at two runs per over as Kamo High's bowling attack was on song.
Martin Tansley (26), Kirk Henderson (20) and Gareth McCullough (34) batted well, with McCullough in particular looking good near the end.
Billy Alexander-Crawford (3 for 39) was the top wicket taker with the rest of the attack bowling tightly.
Onerahi made 150 for nine from their 50 overs, leaving Kamo High 40 to chase it down.
Onerahi started their bowling well with Axel Sheppard (2 for 7) taking early wickets.
However the middle order trio of Mark Turton (33), Zac Chapman (22) and Max Turner (23 not out) helped stave off an Onerahi win.
That was despite the best efforts of Tansley (3 for 12).