"Ys" is a series of action role-playing video games developed by Nihon Falcom. The franchise began in 1987 with the release of the first game, "Ys I: Ancient Ys Vanished." The games typically follow the adventures of Adol Christin, a young hero who explores the fictional land of Ys and battles various enemies. The series is known for its fast-paced combat, engaging storylines, and memorable music. Over the years, "Ys" has expanded to include multiple sequels and remakes, gaining a dedicated fanbase and influencing the action RPG genre.