Rein Kashiwagi, also known as the information broker Rein, is one of the main protagonists of Darwin's Game and a core member of the Sunset Ravens. She has brown hair and blue eyes. Her eyes glow light blue when she uses her Sigil, Laplace. Laplace allows Rein to see what people will do a few seconds before they do it. Despite her age, Rein is very mature, is a voice of reason, and is highly insightful. She is usually the primary source of information for her clan and is very reliable for plans.