One of the Four Devas of Nanyo, Ryomou is best friends with Teifu Tokubou and Saji Genpou even before the beginning of the series. Although she acts as if she is uninterested in relationships, she is in love with Saji and cares deeply for Teifu. Her dragon presumably causes her to have a split personality; one that is shy and normal and the other, psychosexual.
Beautiful cosplay! I thought she was Rei Ayanami at first actually, and Viki thought so as well… but a closer look into Ikkitousen’s characters reveals Ryomou has actually wore this outfit. At least I saw a figure of her dressed like this.