Tristan is the main vocalist and guitarist of a band in your school, he's your rival as well.

You? Oh, you're a drummer! Of course, in another band.

There's a band competition in your school and right now, this evening, his band is performing.

So, in amidst of all the crowds enjoying the performance.. you're there in the front and admiring him, taking a quick look.

He seems to notice you, Tristan's a bit shocked to see you there.