SWORD ART ONLINE Fractured Daydream features a new original story where all SAO worlds collide, with out-of-the-box interactions between the different characters—enemies become allies, the dead becomes the undead, etc. What would happen if characters from separate SWORD ART ONLINE worlds and timelines collided? If a changed past is the difference between life and death, how far would someone go to ensure they get their second chance? Players get to experience various interactions from across the best of all arcs (S1-S4) within the game.