Government secrets? Or just another conspiracy theory.

[Munch]

"The skies above Japan are alive with extraterrestrial activity,", "Kato, who’s a regular salaryman by day, notes that his group has a high success rate with their field trips to Meiji Shrine, but is quick to point out that “UFOs fly everywhere”

If that was true then we wouldn't still be wondering and it'd surely have been in the media at some point too, but I don't remember it.