An iDOLM@STER Cinderella Girls character in the Passion (Yellow Sun) category. She is 12, with long, blonde hair and a kogal fashion sense. Her interests include stickers and beetles. Although she tries to act like an adult, she is very childlike on the inside.
Her sister is Jougasaki Mika. Since she is the younger sister, Rika was nicknamed Imoutogasaki (妹ヶ崎). Her card's high stats in the game attracted many players to obtain her along with Mika.
Due to her popularity, she was selected for the first CINDERELLA MASTER CD series, alongside Futaba Anzu, Shibuya Rin, Mimura Kanako and Takagaki Kaede. Her seiyuu is Yamamoto Nozomi [山本 希望].
She is in the unit "Dekoration" with Akagi Miria and Moroboshi Kirari, and their unit costumes are Pikapikapop in the anime.