Hello,
1. You might not have enough petals in stock. One near Masuo image are just the amount you can buy.
3. Happens after having sex with her you say. Did you had any assistants with you?
4.Was anyone with her like Aoi or Momoko. What point did it occurred? After telling her about you?
5.Again the exact point of quest would be appreciated.
6.A known bug, will be resolved soon.
7 & 8.Will fix that in next update.
9.Will test that and fix.
10.I think something else is problem. Were you in the middle of catching ghost or done catching ghost? That could causing a bug because it uses a different script to close.
11.That's something new. Will need test that.
Others
1.That's why there are orbs so player can have plenty of time completing things. You know a timeless event like Kobayashi's. There will be more like that in future.
2.You have to use candle since this the idea is this was done before the time of original LSH. Flashlight wasn't working well then. You will have some special ghost hunting tools once those vendors are available.