If two or more effects attempt to modify how many counters would be put onto a permanent you control, you choose the order to apply those effects, no matter who controls the sources of those effects.

If you control two Kamis of Whispered Hopes, the number of +1/+1 counters put on a permanent is two plus the original number. Three Kamis of Whispered Hopes add three, and so on.

If another permanent you control would enter the battlefield with a number of +1/+1 counters on it, it enters with that many plus one instead.

However, if Kami of Whispered Hopes somehow enters the battlefield with +1/+1 counters it, its first ability won’t apply to itself.

The last ability is a mana ability. It doesn’t use the stack and can’t be responded to.