Chouun Shiryuu

Anime Chouun is a mysterious girl who appears calm collected and very powerful. She is the second person to join the group. She loves to tease Kanu and other women frequently. She also assumes the identity of a hero of justice named Butterfly Mask hence wearing a Butterfly mask. In Shin Koihime Musou Chouun in Kachou Kamens form saves Ryuubi from bandits with her secret technique making Ryuubi develop a crush on Kachou Kamen. Chouun asked Rybi who saved her and she innocently said good things about her Kachou Kamen is super cool and noble raising Chouuns mood high. Chouun is also scary when shes smiling Sui will have nightmares about it and Shion wont let her daughter sees Chouuns smiling face. Chouun even continues teasing Kanu in more ridiculous ways like an embarrassing introduction of Kanu to the bandits who attacked Ryuubiand Chouun gets a lump on the head as a result. In Koihime Musous OVA Chouun as Kachou Kamen appeared and swam but Kouchuu who acted as the schools doctor said that its okay since Kachou kamens appearance looks like Chouun and she immediately tied up and put into an unused class until night and no one seems to notice her missing even her daughter who asked about her whereabouts before. Visual novel When Kanu was fighting the Tou army she fought alongside Chouun for a while when this war ended Chouun met Kazuto and took a liking to him promising to join his army later. She joins alongside Kouchuu after the battle with Enshou. 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. Source: Wikipedia