Despite the initial mishap, Des De Jeu jumped stylishly from then on to race into contention with 600m to run.
Showing no signs of fatigue, he hunted down the heavily backed Gargarin over the last fence to race clear and score a stunning victory.
Trainer Mark Oulaghan admitted he had written off his charge's chances after the first fence mishap.
"We thought he wasn't a bad sort of an animal but after the first fence I wasn't giving him too much of a chance," he said.
"I was amazed he (Kuru) got back on as I thought he was gone.
"He's a big, scopey horse who jumps well so we think he has a big future as a chaser."
Although he had shown plenty of emotion when crossing the line in front, Kuru was his normal understated self when interviewed after the race.
"It was his first start over the fences and he probably landed a bit steep and just went down," he said.
"I don't really know and can't explain it as it just sort of happened.
"I got back on and he drew himself back into the race. He's got plenty of ability.
"After that first he jumped pretty well although there's still plenty of improvement in him, so it's exciting."
– NZ Racing Desk