In order to bring back Asuna, who remains unconscious after the Aincrad incident, Kirito enters the VRMMORPG called ALfheim Online (ALO) to search for the World Tree. There, he meets a female Sylph Player named Leafa, who agreeds to guide him to the World Tree. But... Leafa is actually Kirigaya Suguha, Kirito's real-life little sister. She agreed to help Kirito without knowing his true identity because she saw a glimmer of her beloved brother in him. Although they have different goals, the two set off on a journey to the World Tree! As the "Sword Art Online" anime gains popularity, here is Volume 2 of the "Fairy Dance" manga!