Chōun is a mysterious girl who appears calm, collected, and very powerful. She is the second person to join the group. She loves to tease Kan'u and other women frequently. She also assumes the identity of a hero of justice named Butterfly Mask, hence wearing a Butterfly mask.
Visual novel version
When Kan'u was fighting the Tō army, she fought alongside Chō'un for a while; when this war ended, Chō'un met Kazuto and took a liking to him, promising to join his army later. She joins alongside Kōchū after the battle with Enshō. She has a strong obsession of menma. She also has a habit of running around the city as the masked hero of justice 'Butterfly Mask'. Strangely, no one other than Kazuto and Shuri can recognize her true identity, despite only wearing a mask.
Voiced by: Emi Motoi
an extended description!