It had been two months since the end of the (SAO) incident. Although the majority of the 6,147 surviving players have been logged out successfully, 300 of them, including Asuna, had yet to awaken for unknown reasons and after discovering that he was at the top of the world tree trapped in a bird cage both Kirito and his sister Leafa were both reach there with the help of yui to save Asuna from the clutches ex-fiance and former lover, the former director of RECT Inc, the former ruler of the VRMMO game ALfheim Online and also serves as the arch-nemesis and self-proclaimed love rival but in Alfheim his name in there is Fairy King however other players want to get there cause the reward on beat it will be getting unlimited flight as a reward so it's a race to see who can get to the top of the World Tree first, to save Asuna along with defeating Oberon.