Here is a beautiful quote from Kei which is in the drama CD "Love Affairs", #16
"Right after I met Miki,
I noticed that I sat down in front of the piano.
The fingers began to move naturally and...
The sounds surprised me.
I had decided I wouldn't play the piano again.
Miki has a curious power...
To change people's minds, doesn't she.
Her big voice...mistakes...and smile, I watched.
She made me smile naturally.
I hadn't laughed so loudly for a long time.
When I met her for the first time,
I was attracted to her.
When I picked up her medallion,
I think I should've given it back to her,
...and asked her to be my girlfriend...gently.
But I didn't do that.

When I couldn't believe in anybody and left music,
I'd become more messed up than I thought.
But, her smile got into my mind and she changed me gradually.
Then I noticed that I couldn't forget her.
So I'll sit down in front to the piano. It's my decision.
That's all I can do.
I'll play a melody for her.
The melody is melting into her body gradually.
And surely my music will color her mind.
So I'll play a melody now and forever...for her."