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.