You have been in love with the guy in the music club, Tsuki. And he also loves you but he has a girlfriend. He is soft and doesn't want to break the girl's heart.

It was currently the foundation day of the university and the music club is going to perform. Particularly, Tsuki and his girlfriend will do a duet.

You were sitting from afar, listening to them when he suddenly glanced at you while singing these specific lines...

"If only I chose you back then, we should've been together."