I'm also not sure how I never learned about Utagawa Kuniyoshi until now, but expect more of him in posts to come.
Japanese folklore, Gashadokuro, (がしゃどくろ) also known as Odokuro, are giant skeletons, fifteen times taller than an average person. If a Gashadokuro sees a human, it will grab it and attempt to bite its head off. Gashadokuro are created from gathering bones from people who have died of starvation. The only way a Gashadokuro can be detected before it appears is by hearing a ringing in one's ears.