Here's how Great Big Story describes the stupefying levels of cuteness captured below:
Imagine an island filled only with rabbits. Okunoshima is a small island in Japan’s Inland Sea. It's called "Rabbit Island" because of the thousands of feral rabbits that roam the land. No one knows exactly how they got there, but since the end of World War II, the rabbits have been doing what they do best … multiplying.
If that's (improbably) not enough cuteness for you, here's a similar bit from the BBC, including this wonderful phrase: "...relaxed to the point of idiocy."