"Sword Art Online: Progressive" is a series of light novels that retell the story of the original Sword Art Online series from the perspective of Asuna Yuuki. It explores the events of the first arc, focusing on the challenges players face while trapped in a virtual reality MMORPG where death in the game means death in real life. The series delves deeper into character development and world-building, providing more context and detail about the game's mechanics and the relationships between players. It highlights Kirito and Asuna's journey as they navigate the dangers of the game and their growing bond amidst the chaos.