There is this one, and I think I might've seen another one floating on the net (maybe on Bilibili):
Yeah, I seen this video and its a nice way to show what theco op playthrough is like though I wish many poeple will post co-op videos of Aqua Ippan without death and no miss, now there are msotly single player mode videos , if the game reaches to its final version, we hope we can see a perfect co-op game play in the future
by the way if you find a bilibili of a co-op video show us the link.