Reina Osborn is a central character in the anime series 'Hikari to Yoru no Koi.' As a transfer student with a mysterious past, she quickly becomes the focus of attention at her new school. Intelligent, reserved, and perceptive, Reina bridges the emotional distance between the main protagonists, playing a pivotal role in resolving the conflicts between light and darkness that define the story. Her journey involves self-discovery, acceptance, and ultimately, sacrifice for those she cares about.