The Mark of Mastery has begun for Kirito, Asuna and Leafa, where they must unlock the seven Sleeping Keyholes. However, trouble follows them into their trials, making their test more of a challenge. The Organization already got Leafa in their sights, and are attempting to bring down Kirito and Asuna, too. It is up to the two to get to the bottom of this, and save Leafa.
Crossover - Kingdom Hearts & Sword Art Online/ソードアート・オンライン - Rated: T - English - Fantasy/Adventure - Chapters: 18 - Words: 251,633 - Reviews: 164 - Favs: 155 - Follows: 102 - Updated: 12/14/2015 - Published: 6/2/2015 - Complete