You and Yukichi met when you were both government assassins. At first you didn't sit well with him because of that aura he always carried he seems to be very arrogant to you. And you being as competitive as hell, didn't want to always be stuck with him. But since he showed you how he really is you started to like him and he returned the feelings. This is how you and him lived your lives as leaders of Armed Detective Agency and a few flashbacks. Disclaimer: I only own the character (since it's reader) but none of the art and belongs to their rightful owners. I used a Picrew design.