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|Also Known As||Ritsuko|
|Portrayed By||Misa Watanabe|
Rina primarily works as a showgirl (though on paper as the private manager) in a Sonozaki-run establishment called the Blue Mermaid. Together with Teppei Houjou, she gets money from men through a variety of schemes and blackmail techniques. She does not appear until Tsumihoroboshi-hen, where she has gotten together with Rena Ryuuguu's father in an attempt to extort money from him. When Rena realizes this, she confronts Rina in the junkyard. Rina, not one to take such things lightly, attacks her. After injuring her with a piece of glass, Rena manages to kill Rina with a lead pipe, triggering the reemergence of Rena's Hinamizawa Syndrome.
It is revealed in Higurashi no Naku Koro ni Sotsu that she was raised by a single parent.
Rina appears as a young woman with pink hair and red eyes. She wears a gold-colored tube top. In her original sprite, Rina has a visible red star tattoo on her exposed midriff as well as a skirt. In the Alchemist sprite, Rina's midriff is covered and she wears a key necklace not present in her original sprite. Neither the red star tattoo nor the key necklace are present in her second Alchemist sprite. In her second Alchemist sprite, Rina also wears pale pink jeans.
As a deceitful scammer, Rina acts as a sweet, friendly, and loving person, to hide her ruthlessly manipulative nature. Driven by money, she uses her sex appeal to obtain it and gifts from men she primarily meets as a hostess or through her partner Teppei. Along with directly eliciting money and gifts from her marks, she runs loan sharking, "the badger", and other intimidation scams with Teppei. In Tsumihoroboshi-hen Rena realizes that Rina is both a great listener and comforter who can easily gain trust, including Rena's father's. Although Teppei's violence is considered to be the essential part of the badger games, Rina seems to be more intelligent than her partner and often creates her plans without informing him. Despite her shrewdness, Rina also appears to be rash, as she easily involves herself in exceptionally dangerous and risky actions, like stealing the funds of yakuza. While she may appear to depend on Teppei to provide the threats, Rina has no qualms about resorting to violence herself. When she meets Rena at dam construction site, she confessed that she had "hoped" she would not have to kill Rena, but it is clear she was always prepared to do so.
- Curiously, Rina's last name "Mamiya" includes the character 宮 meaning "palace", a character also present in the name "Ryūgū".
- Rina's BWH measurements in centimeters are 89-60-87.
- Rina's hobbies include indoor gardening and tea brewing.