Ms. Eight Feet Tall (八尺様, Hachishakusama, also informally called Hasshakusama) is a type of main Japanese spirit (Yokai) that takes the form of an impossibly tall female specter often rumored to have a deep, masculine or an attractive, feminine voice in which she repeats the interjection “Po” [ぽ] repeatedly, and has a habit of preying on children, usually those who are nine to eleven years old.

It is said that Hachishakusama catches her victims by stalking a select child she takes a liking to for a few days or even months. After a certain time has passed, she takes the child away from their family members and their whereabouts are left completely undisclosed ever since. It’s unknown how or why she chooses to abduct them, but it can be assumed that like most spirits, she can also just teleport to the child’s location and take them away with her that way too.

However, there are a rare few of people who have been “liked” by Hachishakusama and lived to tell the tale. Those who are fortunate enough to have survived the spirit’s wrath have to leave Japan and reside in a different country; they cannot return to Japan due to the risk of being hunted by Hachishakusama once more which also prohibits them from seeing their families by extension even under urgent situations, like a relative of theirs passing away.

Basically, don’t reciprocate her affection or pity her too much. If she finds you interesting and you see a tall dark woman watching you intermittently, flee the country immediately. She stalks people to see if they’re a good replacement for her lost son, and “adopts” them.

Source: https://villains.fandom.com/wiki/Eight_Feet_Tall