Sensei doesn't know that the only reason reiji's mom is still alive is because of reiji, AS I SAID BEFORE, IF REIJI DIES, EVERYONE FUCKING DIES, HIS MOM, THE IDOL, THE TEACHER, THE MALE BEST FRIEND THE FEMALE BEST FRIEND FUCKING EVERYONE WILL DIE IF REIJI SUCCUMBS TO VOID, MEANING REIJI IS THE LAST BASTION FOR ALL THESE CHARACTERS