Ruiko is one of Double Smile Pretty Cure characters.
Ruiko is clever girl. She is great at studying. She can play piano and violin. She is student council president and famous in her school.
Before series started
Becoming Cure Ice
Yumeri Kaede - Before she became Pretty Cure, Ruiko was often watching Kaede. She didn't know how can she find so many friends and was jelaous a bit. She was famous in school but never felt like she have real friends. When she became Pretty Cure she became good friend with Kaede.