It would be a good marketing strategy, especially since in general KAT-TUN sell a lot
(Even the instrumentals/interludes in GND's album had tie ins O_o)
I really, really like this single though. Probably the most solid one, imo. Although, PERFECT is my favorite xD I don't think I've ever liked a b-side more than an A-side...
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"Remember, don't let others dictate your music taste. If you like whatever you're listening to, keep listening to it."