Bond Story System (Astra bond stories)

I've recently been trying to finish the bond stories of ZZZ (this particular screenshot is about Astra), but it's not easy because you can't simply binge them in one sitting as they're locked behind bond levels and you can only do three bond missions a day forcing you to do it regularly which I'm not really good at doing.
Astra's stories were cute and I like the whole concept of the super star trying to hide her identity while seeing you. But I still think Vivian still takes the cake between those that I played so far (I'm a sucker for the dedicated type of girl). There's still quite a few bond stories I haven't played though so that may change...