The story goes, Okunoshima island was used by the Imperial Japanese Army during World War II to test and manufacture chemical weapons.
Supposedly, they used rabbits to test the weapons. When the war was over, the chemical plant was decommissioneed and the rabbits were set free.
Another story has Japanese schoolchildren releasing 8 rabbits during a trip in the early 70s.
Either way, Okunoshima island is rabbit island.
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This second video, while not as good of quality, gives you a better sense of the enormity of the rabbit population (I’m assuming this second video is also Okunoshima, as it’s Japan, and rabbits):