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    Sword Art Online Extra Edition (ソードアート・オンライン Extra Edition, Sōdo Āto Onrain Extra Edition) is a special episode that aired on December 31, 2013 on Tokyo MX, BS11 and Niconico Douga and streamed worldwide two hours after on Crunchyroll, Daisuki, and other streaming sites. Most of the episode is a recap with some swimsuit scenes mixed in, while the remaining 20 minutes of the episode shows an original new story about the characters' quest in the Undersea Temple of ALfheim Online. This episode features a new ending theme song called Niji no Oto, sung by Aoi Eir.

    Kirito is called for an emergency counseling meeting at his new school while his sister has swimming lessons with their friends. There he meets an elite member of the Virtual Division of the Ministry of Internal Affairs. Kirito then tells him details about what really happened in Aincrad and in Alfheim.