Rein Kashiwagi

A member of the Sunset Ravens. A first-year middle school girl with a bob cut. She has a mole under her left eye. Her favorite snack is "Umee-bo," and her preferred flavor is natto. She excels in information gathering and is known as the "Analyzer" for her ability to accurately analyze various information. She is not the type to actively engage in combat and has survived by avoiding fights, even referring to herself as a "runaway specialist."

She became a member of the Sunset Ravens after temporarily teaming up with Kaname to escape from a hotel during the "Treasure Hunt Game" to survive. Afterward, she focuses on analyzing the game itself and managing electronic systems, sharing the common goal of ending Darwin's Game. In the world five years later, she serves as the acting leader of the clan and is later officially appointed as the sub-leader by Kaname.

Her superhuman ability is an information processing power called "World Function (Laplace)," which predicts all movements. In combat, she mainly uses Laplace for evasion and sniping. However, it is not well-suited for abilities that are difficult to perceive, such as spatial teleportation. While it is usually exercised against the external world, there is another usage called "Internal Observation," which involves searching for answers within herself.