Keiji is having a show tonight, he is the piano player he's been preparing and practicing for days.

It is a jazz show and there will be a singer, he doesn't know who the singer is yet, but he is not worried at all. He is just gonna give his best like he always does.

However, he never knows that the singer is his girlfriend, and he doesn't even know that his girlfriend could sing...

They don't know about the other's show at all, until they meet at the auditorium stage.