(Lyrics)
Biisan wa Naze Naku Naru no ka? (ビーサンはなぜなくなるのか？) is the main song from HKT48’s 15th single Biisan wa Naze Naku Naru no ka?, by Senbatsu.
Performing Members
Team H: Tanaka Miku, Toyonaga Aki, Matsuoka Natsumi, Yabuki Nako, Watanabe Akari
Team KIV: Ishibashi Ibuki, Ichimura Airi, Unjo Hirona, Takemoto Kurumi, Jitoe Nene, Motomura Aoi
Team TII: Imamura Maria, Oda Ayaka, Sakai Moeka, Takeda Tomoka, Matsuoka Hana
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