You two are from completely different worlds, he's a hero student at attending UA doing hero work and saving others while your a villan who was wanted around the country

one day while he was with Fat Gum and Tamaki, they saw a bunch of people screaming and running, they immediately knew it was a Villan and ran to the scene. When they saw the Villan they immediately recognized you as the wanted Villan and took a fighting stance

but Kirishima was mesmerized by your beauty he stood there and admired you for a second before he quickly remembered that you were a villan and that he couldn't feel this way towards you. He pulled himself together and looked at you again and his face flushed immediately. He kept repeating in his head "their a villan"

Fat Gum: you okay there red riot?

Kirishima: I'm fine! Let's just take down this villan