It is similar to the Scandinavian myling, the Slavic poroniec and the Germanic Aufhocker The Konaki-jiji is said to be able to take the appearance of an old man or a baby.
After the spirit is picked up, it suddenly becomes a heavy stone that crushes the victim to death.
[1][2] In some versions of Konaki-jiji stories, the spirit is that of a baby left to die in the wilderness.
[3] The Konaki-jiji can be traced back to family records in Shikoku where the term was used to describe an old man who sounded like a child when he cried.
In the manga it appears as a creature with the large head of an old man, the shell of a turtle, the arms and legs of an infant and a long hairy tail.