 Anju's origins are unknown, save that he was adopted by a noble family that was later exterminated under Emperor Senka's purge.Unbeknownst to Shūrei, she actually met him when she was ten-years-old and working at the Kogarou, where Kochō had taken him as a lover.Thus, Anju expresses great interest towards Shūrei, sometimes giving her pieces of vital information.