Mamiya Rina

With her gorgeous appearance and smell of perfume, she's great at picking up men. Although she looks very shady, she seems to be involved with Rena's father.

Rina was a hostess at the club Blue Mermaid and was dating Houjou Teppei, joining him in loan sharking and badger games where Rina dates other men and has Teppei accuse them of stealing his girl and then blackmailing them for money. After seeing how much Rena's dad had to spend, Rina started dating him in an attempt to claim another badger game victim.