pretty much everything you are asking for are items that can be bought for coupons or are rewarded for weekly events with a few being purchasable in the new Groceries store.

Group summon is a lot like ninetails but with the added bonus of being able to use it in GNW.

Skillbooks (since skillbreak doesn't really work right now) are in the same area as the awakening just pick breakthrough and select a skill you want to upgrade then just collect that ninja's ninja fragment til you have enough.

As for Ninja's and not sun shop assist scrolls well there's the weekly events see if they have them and yes this game as new OP broken ninja's the super rare in the treasure pulls not so much but the event ninja like Konan (Angel of God) or recently Madara (Kage Conference). This is something that will always be a thing to incite spending.

As for mood scrolls and tactic pages they still cost primarily though mood scrolls are a bit easier being you can get a lot during some events.

Sorry if I didn't answer all of your question completely too lazy to read a wall of texted(Ironic, right?) but hope it helps.