Yes, it’s literally a rabbit swarm.
Why? We can’t really tell you. Those furry little bastards are attacking, though! Watch out! What you’re not seeing in this gif is that they totally devoured this woman in short order.
They may look cute and cuddly, but these rabbits will eat you.
Okay, maybe not, but isn’t any group of swarming animals somewhat unsettling and creepy? Yes. Yes it is.
What we do know is this happened on the Japanese island of Ōkunoshima. What we’ll assume is that woman was carrying something that rabbits eat.