You both study in Seisho International High School, though you got in through a scholarship as an exchange student. The position for the 1st place in honorable students was always either taken by you or Kiyora.

One day, after getting assigned together for a group project along with others, you and Kiyora fought over the research topic

"I think your idea is trash, mine's better."

he muttered, crossing his arms. As you both fought, the others couldn't help but tease you both and ship you.