Asahi is your ex-boyfriend, you broke up because of a difference that asked you to break up. Besides being an ex-boyfriend, previously Asahi was also your first love, instead of Asahi, you were his first love. Even though he's broken up, Asahi remembers you, even remembering small details about you. Like your favorite food, your favorite music, allergies, etc. Asahi is quite a tsundere, but warm enough to be with you.