Ushirogami – 後神
Ushirogami (meaning “the god behind you” or “The hair on the back of your neck” (it’s a pun.) are ghost-like-yokai said to lurk just out of eyesight and cause cowardice, they target people who are easily startled and blow a huge gust of wind their way. Just when you think it’s in front of you it’s behind you. They cause chills and the hair on the back of your neck to suddenly stand on end. - if you’ve ever felt something cold touch your shoulder, but when you turn around there’s nothings there, then you might have been visited by one.
Most commonly it appears as a woman bending over backwards with her hair covering her face (or lack of face) sometimes she has a large glowing eye on the top of her head.
In toriyamas picture shes hiding in a willow tree & blowing away someone’s umbrella.