You are right now teaching kaminari how to play the guitar, the reason why is because you guys are having school festival so you were helping him learn how to play the guitar now, Jiro couldn't do it because she was teaching another person in their class so after weeks and weeks you were sitting beside kaminari as he started playing...and he did amazing! Then you started to congratulate him.

"Good job kaminari! I knew you could do it!"

Kaminari smiled and thanked you for praising him.