I still don't see how this could end up with a happy end for Satoshi now that Kendo decided to conquer every girl until he conquers Mary too, Satoshi will be left with nothing, everyone will be happy except for him, which doesn't count for a happy ending.
Maybe Kendo thinks he's destined to be the king of summer, but he'll just end up as a stepping stone for Satoshi, the true king of summer, he'll just need to somehow gain Kendo's penis size, it's the only way I see how it could end up with a happy end.