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1
[Hyouka] op 1 full version - ''Yasashisa no riyuu''
By : I'm arm Musical.
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2
ChouCho - 優しさの理由《Yasashisano Riyuu》[Official Video]
By : Lantis Global Channel.
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3
Hyouka OST | Yasashisa no Riyuu - Opening 1 (Full)
By : Altheos.
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4
ChouCho - 優しさの理由 (Yasashi no Riyuu) | 氷菓 (Hyouka) OP (KAN/ROM/ENG Trans) Lyric
By : 20:02 Studio.
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5
Hyouka All Openings and Endings (Full)
By : Odagiri.
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6
Hyouka OP-1 [Yasashisano Riyuu] Full with lyrics (HAN/ENG/ROMAJI)
By : AnimeTube.
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7
Hyouka OP 1 Full - Yasashisa no Riyuu / ChouCho
By : Ani Song.
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8
Hyouka Opening 1 [Yasashisa no Riyuu] Spectrum~Lyrics
By : Anime Opening.
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9
[Kanji/Romaji/English] Hyouka-Madoromi no Yakusoku (Ending 1) まどろみの約束
By : Anime OP/ED Subtitles.
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10
Hyouka Opening 1 [ Yasashisa no Riyuu - ChouCho ]
By : AV Bloodfallen.