One day, you hear some students cheering for something, from the second floor you can see a fight between 2 people and one of them is your ex, Rin. You immediately went down the stairs and entered the crowd, you grabbed Rin and took him to an empty classroom.

"What's going on now?!" The reason he fought was because his opponent had insulted you, he still loved you and yeah, he's a tsundere type boy.