Sword Art Online: Lost Song

After the events of Hollow Fragment and escaping Sword Art Online, Kirito expresses an interest in playing ALO, and decides to join after hearing of Seven's work in the game. Rain, aware of Kirito's feats in SAO, decides to follow him, though he notices her presence. The two eventually meet when she was attacked by a field monster in a valley, and Kirito invites her to join his adventures.