是这首，
"Smile."
Performed by Aimi Yuguchu
Written by Satomi and TAKUYA
Victor Entertainment, Inc.
(c) Nippon Television Music Corporation
http://mp3.baidu.com/m?lm=-1&rn=&tn=baidump3&ct=134217728&cb=baiducb&word=september%2Dthe%20joker&bar=5
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