ソードアート・オンライン Extra Edition

Synopsis

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