A Kaze No Kami is an evil spirit from Japanese folklore that travels upon a yellow cloud of pestilence that brings disease and sickness to any they pass over.
In addition, they can also bring misfortune via manipulating the wind, causing crops to fail and spreading misery across the land.
They are part of the Yakubyo Gami, a subtype of yokai, who are devoted to spreading sickness and disease. As a result, they are also among the most evil and demonic of the yokai (excluding beings such as the Oni).