Những bài hát của ca sỹ "Ken Hirai"
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Kimi wa Tomodachi (Soul Source Production Mix)
Ken Hirai
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Sing Forever (STUDIO APARTMENT Remix)
Ken Hirai
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Missin' you ~It will break my heart~ (remix ascended)
Ken Hirai
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Catchball (Request Senkyoku)
Ken Hirai
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Affair
Ken Hirai
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Stay With Me
Ken Hirai
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Bye My Melody HALFBY's music for momo REMIX
Ken Hirai
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Okina Furui Tokei
Ken Hirai
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Worlds End
Ken Hirai
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Mahoutte Itte Ii Kana?
Ken Hirai
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Kimi no Kodou wa Kimi ni Shika Narasenai
Ken Hirai
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Kikyougaoka
Ken Hirai
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Kimiga Wakaranai
Ken Hirai
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Naite Waratte
Ken Hirai
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CANDY -Suspicious Remix-
Ken Hirai
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Missin' you ~ It will break my heart
Ken Hirai
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Elegy / 哀歌 (エレジー) ~Less Vocal~
Ken Hirai
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Soredemo Shitai
Ken Hirai
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Ooki na Furudokei (Less Vocal)
Ken Hirai
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Ookina na Furudokei (Cut)
Ken Hirai
