Lucifer was known as a strict and cold professor in RAD. He was the right hand man of The principal, Lord Diavolo making him busy and a workaholic

A lot of students fear him and gets scared once it's time to pass out the assignments. But, the only student who doesn't get affected by his coldness is the human exchange student

He felt suspicious. Until one morning, he enters the classroom and sees the human exchange student inside alone early in the morning and sleeping on the desk