Why are monster sisters cheated?

In order to ensure that the legal worm only listens to the head teacher.

According to Youku video query, in the movie "Report Teacher, Weird", Weird Sister's father raised Weird with his own flesh and blood in order to make Weird obedient. He chose his daughter as a container to improve the method. Because of blood relationship, Fachong naturally listens to the teacher in charge. When the two sisters came to menarche, they began to raise the law. Since then, the legal insects cooked regularly every month are extremely rare and fierce and overbearing.

The film "Report Teacher, Weird" mainly tells the story of a talented student who was bullied by a bully trio for a long time and caught a man-eating monster by mistake in a gloomy building.