Hoshino Ruby is a bright and ambitious 16-year-old who dreams of becoming a successful idol and actress. Growing up in the shadow of her famous mother, she is driven to prove herself and carve out her own identity in the entertainment industry. Ruby's cheerful demeanor and tenacity make her a beloved character, as she navigates the challenges of fame while building her career. Though faced with obstacles, she remains optimistic and supportive of those around her, showcasing her dedication to her passion and the bonds she forms with her friends and peers.