Ryomou Shimei is one of the members of Nanyo's Big Four and one of the closest friends of Sonsaku Hakufu.
Ryomou is discribe to be a hard girl, ever letting anyone see her softer side save for Saji Genpou, the blind and crippled Teifu Tokubou, and of course Hakufu herself. One of the things she's most serious about is defending Hakufu, even in the amidst of the Yummy and Greeed. She refuses to trust Anhk, and not just because he is one of the five monsters Hakufu is fighting against, but also because he is only sticking with Hakufu to rebuild his body. Her distrust of him increases due to him being the only thing keeping Koukin alive.