Here is some absurdity, Point daruma said:

But main site said:

Can someone explain, i want save my point to exchange kijimuna summon card - empress. But as main site, my point will reset weekly, but point daruma said i can save up my point. I dont know what is true.

The in-game description is the correct one. i.e. You never lose any points.

I can verify this. Good luck with that Empress though, and I hope you have better luck than I did with my Princess card. $10 worth of OC and what do I get? A cowardly Kijimuna. Needless to say I set that useless fucker free.