Reiko Zettai is a mysterious and enigmatic character from the series Yokohama Kaidashi Kikou. She is known for her calm and composed demeanor, often seen wandering the serene landscapes of a post-apocalyptic Japan. Her presence adds an air of tranquility and introspection to the series. Reiko's interactions with the main characters, particularly Alpha, provide deep philosophical insights and reflections on life and humanity. Her role in the series is significant, as she embodies the themes of change, memory, and the passage of time in a world slowly fading away.