[You have defeated all appointed magicians on your own]
[You have passed the Sub Story.]
[As the main contributor, you have received 3000 coins as compensation.]
[You have received the qualifications to enter the secret room.]
Finally, I managed to take out all the girls that had been brainwashed. Naturally, I did not kill them and only knocked them out but it seems to be enough to pass the sub nightmare.
Fortunately, that guy was not specific enough and an
"I only received 3000 coins? Tck! I thought I would get around 10,000 coins at least."
[The constellations says you should not be too greedy.]
Perhaps I was being too greedy. In the first place, taking out these girls was just a sub Trial, not the main Nightmare. Expecting to get 10,000 coins in a sub nightmare was a sweet delusion.