Hello. It makes me happy that you like it. Regarding your questions:
1. In Aoi's route.
2. Aoi's route will allow you to meet her in other places.
3. Arcade is closed during mornings. Kaori works in the story during afternoon. Yes, even on weekends.
4. In-depth guides are rewards I send to my Patreon supporters, but you can always come to the Discord server and ask there, me and other friends will answer most of your doubts.