Tomoe explained how everything was basically going to go down. They would stay in Class 4-A until the new school building -where Class-S will stay- is made. The new building will be made in 1-2 weeks and Tomoe will only pop in during every first and last periods of the day. When the new building is made,Tomoe will let them in on some "secrets" and will teach them all on his own -with some minor help from other teachers if he asks-.
When his students asked about these "secrets",Tomoe only answered back, "It isn't a secret if they were told so easily,right?"

  "Teacher Tomo! I have a question!" shouted a person we have not met yet. We'll call unknown characters using numbers like:[1].

  "Why not we play a small game while we have time?"

  "A game?" asked the class in unison.

  "Simple. If you want to ask me a question,you have to introduce yourself."

  "Oh,that's easy!" said [1] "My name is Hani Wazazi and I'm 18. It's a pleasure to meet everyone!"

  "Excellent Hani,what was your question?"

  "Well,from what I saw in the auditorium,you're very strong. You're not gonna hurt us,are you?" This was a question that quite a lot of students had on their minds. Tomoe showing his strength against Hans,and looking like he felt nothing despite having his arm broken just an hour ago,made all the students,not just his class but the entire school,quite scared of him and unsure of how to react.

  "In accordance of the rules,I am not allowed to hurt any of you unless you attack me first. And even then,I need to do my best to resolve it without putting any of you in pain. So,I will not hurt any of you and will try to protect you as much as possible." These words,despite some thinking it was manipulative and just straight-up lies -despite hearing the Headmaster say the rules in front of them-,these words were extremely reassuring and they had become less scared of Tomoe. Wary, but not scared. "Any other questions?"

  "Yeah,what's the point of having someone like you be a teacher?"

  "You have to introduce yourself first."

  "Everyone here already knows me."

  "I don't."

  "WE LITERALLY JUST FOUGHT!"

  "We did?"

  "Ugh...MY NAME IS MAMORU HANS AND I WANT TO KNOW WHY SHOULD I BE TAUGHT BY THE LIKES OF YOU!"

  "Your introduction could have been a bit better but it was overall fine. Anyway,you can leave this class if you like."

  "HUH" asked the entire class at once.

  "This class is meant to test you. On your brilliance,your strength,and your overall skill. If at any point you cannot handle it,I can transfer you to another class." Hans was going to go on another temper tantrum but he was tired and didn't want to bother.

  First period ended and Tomoe left the classroom as fast as possible. He went straight to the Headmaster's office.

  "What're you doing here? I thought I told you you can do whatever you want that doesn't break the rules."

  "I have been wondering. Why are there so many Rin running about?"

  "Ah,that. Well...you see,I made a deal with the Taize and it was that none of them or any of their henchmen can attack us. They wouldn't attack us,and I wouldn't attack them."

  "Then?"

  "It only goes so far. My deal only extends to people under their control. If there's a rogue Rign or one under the Royal Family,they could send a Napalm here if they wanted."

  "Napalm?"

  "One of the worst bombs on the planet."

  "I see...So all the Rin around here are strays?"

  "Yep. The deal doesn't extend to them and I'm getting too old to kill all of them."

  "And you want me to kill them for you despite breaking my arm?"

  "Hey,I said I was sorry."

  "It's...It's fine. I just want to know why they're so attracted to here."

  "You and I are like magnets. I'm a renowned hero and something everyone wants to kill,and you're a superpower everyone doesn't know how to feel about. The mana that emits off of us is probably driving them mad."

  "Mana?"

  "Ah,the name for it must have changed. Pur Stanya is the translation I think."

  "I see. By the way,how many classes are there?"

  "There're 17 in total. Classes A-D for the 4 long years of 15-18 that these kids stay here for. And then your class,Class S."

  "Quite a lot. Hm?"

  "It's a lot but, nothing I can't handle."

  "I will be here for 1 year,huh. Anything I should know about the students or the teachers?"

  "Hmmm. You'll probably get along with some of the gym teachers. They love talking about justice and the fact that you're killing Rin probably makes you their idol."

  "Oh gosh."

  "Oh. And you'll probably get close to Amelia. She's the school's nurse and extremely talented. With the amount of lasting scars you have,it'll probably help to get some aid from modern medicine."

  "That's good to kno-" Tomoe was interrupted by an announcement over the intercom.

  ATTENTION ALL STUDENTS AND TEACHERS. PLEASE STAY IN YOUR CLASSROOMS. THIS IS A DRILL AND EVERYTHING WILL BE LOCKED TO TEST THE MECHANISMS.

The sudden announcement scared quite a few people but most were unaffected as they were used to it.
All the doors and windows in the school closed and locked. Letting 0 natural light in. The bright indoor lights turned on,letting a warm but harsh blue light shine the hallways and classroom.
Some doors and windows were still unlocked. For example,the Headmaster's office. The Headmaster took out his Fult and when Tomoe peeked over,he saw a map of the school. The Headmaster had full power over the entire school and could lock or unlock any door or window.

  "What does that mean?"

  "Ayy,they said what I told them to. This place is ran almost completely by technology so we test everything once in a while to make sure nothing broke."

  "That's good to kno-" Tomoe was interrupted again but,by the Headmaster this time.

  "More importantly,I told them to say that when there's a Rign loose. When a dangerous one is running around the campus."

  "Oh."