General gameplay tips-
1. Crime mechanics - robbing people increases crime. Forcing guilty people to confess decreases crime. High crime means the ladies don't appear at night, but the rogue does.
2. Learning from the grimore before 12pm costs no hp.
3. A new day restores your MP to full. SP restoration is through the resting screen after learning the skill, doesn't advance time.
4. Going out advances the time slightly.
5. Nothing you do to the girls, money, relationship, food, in the initial loop (loop 0) can be saved. Only grimore progress and dark energy. The day resets on the 17th so you can send the girls to jail on the 17th for maximum efficiency for the scene.
6. You can use mind control on the girls and select cancel to simply lower their resistance and gain some dark energy.
7. Some events need high levels in multiple skills to be successful.
8. Having sex with the girls increases relationship. The highest relationship girl will be your ending if all 3 are your girlfriend (memory edit).