My Horror Game Has Become Reality

Warning: This alert takes effect immediately and will remain in effect until after sunset tomorrow! Attention, this is the Ning'an Academy radio station! The academy is committed to maintaining a safe and pleasant campus. If you encounter a black cat on campus, stay alert. There are no black cats at this academy. Each flight of stairs in the dormitory building has exactly thirteen steps. If you find that a flight has any number other than thirteen, immediately find the nearest handrail, grip it firmly, and proceed with your eyes closed... We sincerely wish you a pleasant campus life!