Rena is the youngest member of the idol group SPR5, known for her diligent and hardworking spirit. Her appearance features long blonde hair often styled in twin ponytails, blue eyes, and a signature yellow and white idol outfit.

As part of SPR5, Rena performs in the group's musical numbers. This includes the ending theme "With Your Breath," featured in multiple episodes, and insert songs such as "Incomplete Notes" and "Koi no Maho" in episode 1, plus "Alcyone" in episode 10. These performances contribute to pivotal story moments.