There is this girl, and this boy. They were classmate. 

One day, they both late going into the classroom. Since everyone in class hate the subject, everyone wanted to sit at the back of the class. Unfortunately, the girl and the boy have to sit at the front row, right next to each other. Side to side. It was only them at the front row.

The girl and the boy got a history. They used to be close. Something happened, they got to be far from each other

Both of them sat next to each other, right infront the teacher desk. It can be said, that the teacher couldn't see what the boy nor the girl were doing, since both of them sat lower than the teacher.

Suddenly, this boy sang a song softly. It's called 'Sewindu'. The song tells a story of a boy who decided to stop waiting for the girl to like him back, because the girl choose another person. 

Hearing her friend singing this song, the girl joined him singing. The girl actually liked the singer of this song,  Tulus, so she casually joined without thinking much.

Since both of them used to have a history, and suddenly turn into strangers, the duet can be count as the first time they talk again . Even in the middle of the class, when the teacher was teaching. 

Both of them didn't care. They continued singing until half of the song. No one knows what makes them really think no one can hear them sing. They enjoyed that time. But after singing, they came back to their reality. Turn into two strangers who's never talk before. They don't talk no more, until now.

Long time after that, the girl realize something. The song the boy was singing probably meant for her. Since the song tells about stop waiting for someone they like. The girl feel sad, knowing how the boy always gave her hints before, and the girl  never realize or even respond to the boy's hints.

That's  the end of the story