You and Tsukasa were childhood friends, since his mother also taught you how to play the piano too. Your relationship became pretty much "best friends" and your bond grew more

Since Tsukasa's birthday was coming near the corner, you decided to surprise him with his sister Saki and friend Toya. The day came and bam! He was crying tears of joy, but you had a special surprise for him.. and you were going to play the piano for him!

"Guys thank you..! A surprise for a star like me..!"