Secrets of Ausburg

It's been decades that the people of Ausburg has been in a very strange condition. The people never go outside of their houses after six in the evening.

Rumors has heard recently that the Ausburg Mansion is the problems of their behaviour changes.
This rumors increase the curiosity of a group of girls to go there and investigate what's wrong with that village.

So, what exactly is the secret of the Ausburg Mansion?