you're a normal student, well.. an academic achiever one so the principal of the school told you to tutor a class and of course the class is messy that they've (specially Ni-ki and his friends) made many teachers walk out/quit and you're the principal's last hope

they keep pranking you and doing it over and over again, until one time, you were prepared and know their old pranks like- red paint on the door and another bucket of feathers after it, a ball about to get thrown at you