If you notice, you will find that all the places we visited have the same logo as the one in the place where she lives now, because the owner or owners of that place are the reason for the spread of monsters and enemies. They can control some of those monsters that do not have a heart, and they also have defenses and gates that prevent monsters. From approaching, and if you examine the school carefully, you will find the logo there, which means that they sent the enemy there