Azukiarai

During the night or dawn, Azukiarai sharpen azuki near brooks and the waterside. Even if you can confirm its true colors, it disappears. There is a possibility to be dropped to water when approaching.

There are those who sharpen the red beans while singing "Azuki togouka hitototte kuouka shokishoki" too.

How they look has various theories, that of diminutive grandpas, old women, and children. But the leading origin theory is the ghost of a boy from a temple.