Atelier Sophie: The Alchemist of the Mysterious Book is a Japanese role-playing game developed by Gust. It is part of the Atelier series, which focuses on alchemy and crafting. The story follows Sophie, a young alchemist, as she discovers a mysterious book that possesses a soul. Together, they embark on a journey to unlock the secrets of alchemy and improve Sophie's skills. The game is known for its charming characters, vibrant world, and engaging gameplay mechanics.