YUHI
A few days before.
When he woke up without her beside him, he became frantic, 'We have to live apart for awhile Yuhi.' When she came before and took all her stuff away like that, he really did think that was it. She didn't even leave a single piece of furniture of hers behind.
He was under the impression that she just disappeared after being comforted. She's selfish like that after all. However, spotting a sheet on his desk he immediately rushed over and grabbed it. There was a single sheet music, with half the lyrics and half the music done. She left something behind. Although to others it may seem insignificant since they can't be together now, for him it's enough.
He doesn't go to her concert.
He doesn't have to, because he knows.
That no matter what song she is, she is singing for him.