One day, a fire brokes out in the house of a wealthy man who had many children. The wealthy man shouts at his children inside the burning house to flee. But, the children are absorbed in their games and cannot understand his warning, though the house is being consumed by flames.
It is a well-known fact that when you have a pet, you have to feed it food. Some animals eat pellets while others eat other animals because that's all a part of life. One of the most common "feeder animals" (a feeder is an animal that's used for food) is mice, which is what this story is about.