Sword Art Online: Extra Edition
Kirito and the others decide to go on an underwater quest within the world of ALO to grant Yui her wish to see a whale. As they all prepare for the quest, they face a shocking revelation... Leafa (Suguha) is afraid of water. So, Asuna and the other female members decide to teach Suguha how to swim at a pool in the real world. Meanwhile, Kirito was meeting somebody... Source: Aniplex
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 recap episode that aired on December 31, 2013 on Tokyo MX, BS11 and Niconico Douga and featured new footage for the series. The episode was streamed worldwide at midnight (UTC +9) on January 1, 2014 on Crunchyroll and Daisuki. This episode features a new ending theme song called Niji no Oto, sung by Aoi Eir.