水男孩2的表演音樂 =) - 日劇

不好意思~我想請問各位大大
http://www.youtube.com/watch?v=SJfSc9iLNms&feature=related
影片中的表演歌曲 (26秒開始那首歌) 曲名有人知道嗎?
我覺得好好聽 =)
最近暑假又開始"複習"我愛的日劇=) 希望有好心人 可以幫忙解答啊
感恩=)

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