Rina is a showgirl who works at an establishment called the Blue Mermaid. She is Teppei's lover and cohort in extorting money through a number of schemes and blackmail tactics. During Tsumihoroboshi-hen, Rina starts datingRena'sfather in a scheme to extort money from him. When Rena gets word of the scheme, Rina attempts to attack her to silence her on the matter. But Rina winds up being murdered by Rena.