I feel like the structure of questlines in the academy arc is kinda limiting.
Most girls are available only in either morning or afternoon, so there is nothing to do in the evening. But worse part is, a lot of them that available in the afternoon are also locked behind the progression of the girls in the morning, so there is nothing to do in the afternoon either.
Then by the time we can make progress on those afternoon girls, there are barely morning girls left so now it's reverse, nothing to do in the morning.
I suggest you should swap some of them around to balance them out, or make the starting point of the questline like Lustia available in both timeframes.
On the other hand, I really love how you developed the relationship between girls in the harem. This make it feel like real harem rather than just dating multiple girls in parallel. Good job here.