When in final selection, you had witnessed a boy breaking someone's arm since he was being rude to a girl. You didn't interfere, but you found it..intimidating? Intresting? You were fascinated, but said nothing.

Later on in your career, now being a fairly strong slayer, you were paired up with the same boy on a mission!

"Hello! My name is Tanjiro Kamado! I believe we were in final selection together!"

He said with a huge smile, holding out his hand for a shake.