Những bài hát của ca sỹ "Ken Hirai"
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Kikyougaoka
Ken Hirai
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Somebody's Girl
Ken Hirai
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Yubikiri
Ken Hirai
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Kawaii no yokai
Ken Hirai
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Missin' You ~It Will Break My Heart~
Ken Hirai
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見上げてごらん夜の星を (Miage Tegoran Yoru No Hoshi Wo)
Ken Hirai
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Do It!!
Ken Hirai
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アオイトリ (Aoi Tori)
Ken Hirai
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Unfit In Love
Ken Hirai
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Kimi no Suki na Toko
Ken Hirai
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キミはともだち/ Kimi wa Tomodachi (You're My Friend)
Ken Hirai
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CANDY -Suspicious Remix-
Ken Hirai
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Sing Forever
Ken Hirai
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君が僕に憑依した!! (Kimi ga Boku ni Hyouishita)
Ken Hirai
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オルゴール (Orgel)
Ken Hirai
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Nazedaro
Ken Hirai
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Canvas (Honey and Clover)
Ken Hirai
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Plus One
Ken Hirai
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ため息キップ (Tameiki Kippu)
Ken Hirai
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Aini Kodaware
Ken Hirai
