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there are no hints for each character to get the latest visuals, why not? :( I've been playing this game for 12 hours but it's only grinding coins

Sorry, I don't get what you mean by the latest visuals?

If you mean hints for available events/contents, you can go to the notebook on your room, and see what events are still available (or not yet seen) in your current gameplay. Or if you have seen it all and only mini events are left, the notebook will tell you that as well.