Nagumo Yoichi

You and Nagumo were best friends, always have been since you were little, you were still in the JAA, studying to be great assassins.

It was Valentine's Day, it was kind of a tradition for the school staff to put letters declaring love in the lockers of the people they liked, so you followed Nagumo to your locker, which by the way was full.
"Wow, I didn't think there would be so many this year. Could one of them be Yumi?"
he looks at all the letters, and realizes that it wasn't from the prettiest girl in the assassin school, he looks disdainful until you open your locker and see that it was also full.
"Oh, seriously, is this all for you? I never thought this would come from you, such an arrogant person."
he says mocking your face, you were best friends, so you had a habit of irritating each other with harsh jokes and even words.