She serves as the student council secretary at Oogai First Public Middle School. She is Mana's childhood friend. Mana always protected her in the past, which causes Rikka to consistently trust Mana, yet Rikka always protected Mana when she was causing trouble. She is also ranked among the ten best students in national mock exams. She introduces herself as "The light of intellect! Cure Diamond!!" (英知の光!キュアダイヤモンド!! Eichi no hikari! Kyua Daiyamondo!!)
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