It originated from the Tendai belief in the late tenth century, and later spread to other Buddhist schools.
[1] It is a form of narrative music,[2][3] and often incorporates foreign non-Buddhist deities.
The earliest known work in the genre is "Nijügo zanmai shiki", written by Genshin in 986.
[2] Kōshiki is a liturgical ritual performance, which talks about an object of devotion.
[2] The general structure of kōshiki begins with an intention statement, followed by prose sections.