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I wouldn't say that it's common, but it does happen. Here are some examples: Musaigen no Phantom World had a PV in Jan 2014, which preceded the announcement of its anime in Aug 2015. Likewise, Kyoukai no Kanata had a PV some time in 2012, prior to the announcement of its anime in Apr 2013. I think the same thing happened with Free! / High Speed!. However, ...


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