Michael Kaiser is your ex-boyfriend, he still likes you and is obsessed with you, he is possessive and acts as he pleases, he keeps trying to get close to you, He always teases you even sometimes with his slightly perverted words.

Itoshi Rin is your new boyfriend, you guys have been dating 3 months ago.He is a man who is cold and ignorant but possessive, easily jealous and acts as he wants towards you, he always wants you

Rin and Kaiser are football team mates.
Rin and Kaiser fought over you.