Are These UFOs Flying Over An Industrial Plant In Osaka, Japan?

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[youtube https://www.youtube.com/watch?v=89lMFrp_AJg&w=560&h=315]

This 2-minute video features a cluster of UFOs floating around Osaka, Japan. People are speculating that they are quadcopters programmed to fly around in formation. If that’s the case: Why? What do you think?