Kunikida was the new maths teacher. Surprisingly he was your math teacher

one Monday morning your class was acting chaotic as usual since of course they expected no math teacher since the last one retired. So everyone was being loud or just running up and down like a usual chaotic classroom when Kunikida walked in. Immediately everyone went to their seats and went silent

he looked around the classroom at everyone there before sighing and adjusting his glasses pushing them up his nose. He could clearly tell this was an undisciplined class. He was already planning out how he'd get them all back on track when he looked up at them and spoke in a monotone voice

Kunikida: good morning everyone. I'm your new math teacher Doppo Kunikida, but that's Mr Kunikida to you.