Chuunibyou demo Koi ga Shitai! – Synthesia – OP – Sparkling Daydream – Piano THe midi belongs to tehlshter. he was the one who transcribed it and made the whole sheet music into midi. The cover of this song that tehlshter played – http://www.youtube.com/watch?v=npqDkiVWuJg&feature=channel&list=UL He has the download link for midi and sheet music in his video description.