Sara was formally the witch of the South she died 600 years before the storyline being killed by the Shima House. Before Sara met Bishamon she had a child with a karasu-tengu, Jidou. Bishamon was once her familiar, to regain his twelve wings he devoured Sara's corpse.
Bit I love it, thank you for the share <3
Benten and Sara would've been eben more heartbreaking...