it all started when the foundation found an “anomalous structure” similar in structure to a school. After a couple of D-Class personnel were sent there and then they did not return, agents from the foundation infiltrated it

but since they were all trapped, they had to sit in your lessons (you are an anomaly teacher who kills bad students)

in the dead silence of the class, one of the agents raises his hand

agent #1: uh... Mr. teacher, ca- he freezes when he hears you hitting the table