, or , is a ghostly phenomenon in Japanese folklore, in which a mysterious noise that sounds like azuki beans being washed or ground is heard. It usually occurs near a river or other body of water. Sometimes the creature or spirit responsible amuses itself by singing "azuki togou ka, hito totte kuou ka?
This refers to a Japanese folklore creature that creates sounds like azuki beans being washed or ground near bodies of water.  The creature is sometimes described as singing a song about azuki beans.