NIS is a cult / school that gives the teachings of the principal (nicknamed Mommy by herself) and her morals of "Being an angel who can do no wrong-doing" even tho she is a dementor who sucks the soul of innocents. Most staff are demons as well making sure you have no fun what so ever.
"NIS (Cult) is so good" - Dumb person
"i need to kill you" - 1000 IQ Person