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Originally Posted by ayu_fan929
it just all depends on the singles tie-ups imo. the 3 songs in "Seishun Amigo" all had drama tie-ups that had good ratings.
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Just want to add to your logic. The single also sold really well because of who was on it. Kamenashi Kazuya is part of a group called Kat-tun, who has a huge fanbase, but has yet to release anything. So a lot of the fangirls probably went crazy when they saw a member actually releasing something.