"Utsuho," literally "a tree hollow," is a word associated with Utsuho monogatari, a 10th-century Japanese novel.

It relates the tale of a child of noble background raised in a tree hollow in Kyoto.

As a young boy, he receives songs of esoteric power passed down by his mother.

He grows up to become a master player of the koto, a stringed instrument akin to the harp or zither.

Utsuho A hollow filled with magical powers.