A student in Nanatsu Hashi Academy for girls, which only rich people can afford because she's the heir to the Yotsuba Zaibatsu. She's childhood friends with Mana and Rikka. She's a kind person, sweet, talented and gentle, but often flaunts wealth involuntarily.

She introduces herself as "Sunny warmth! Cure Rosetta!" (陽だまりポカポカ！キュアロゼッタ！！Hidamari pokapoka! Kyua Rozetta!)