This is FPE School. A place where failing means death. The failing grade is F. Therefore, you must study hard.

One day, a female teacher named Miss Celia arrived.

A few days later.

Suddenly, Miss Celia starts insisting she's a Creature, threatening to attack anyone who messes with her. She subtly avoids acting this way toward men, while secretly planning to actually attack the women (though she can't really do it since she's not a real Creature)!