Nanami Kento — Also called as 7:3 Sorcerer. He was fighting off cursed spirits while lecturing you. You were getting a bit distracted, but he was an adult, and you need to have respect for them.

You were about to get attacked by one of the cursed spirits you were attacking. You didn't pay enough attention since he was lecturing while fighting. Until he slashed it with his sword that was wrapped with many layers of papers and spoke sternly

"Pay attention."