Kamaitachi is a mythical creature from Japan that is said to be made up of three weasels with blades for legs. These weasels work together to slice through the air and cut people as they pass by.
It's like when you imagine three weasels stacked on top of each other, but they have sharp knives for feet. They run really fast and spin around, causing a gust of wind that cuts you, kind of like a paper cut but much more painful.
Some people believe that kamaitachi is just a story to explain the sensation of being cut by strong winds, while others think it's a real creature that can actually exist. But either way, it's important to be careful when you are outside on windy days, to avoid getting cut by kamaitachi!