Kirito, Asuna, and Yui spent their days in peace in the VRMMO “ALfheim Online”, which is based on Norse mythology. But then, a sudden announcement was made. “We will be carrying out urgent maintenance today starting now.” After hearing the announcement, Yui, who appears different than usual, departs somewhere. While Kirito and Asuna were chasing her, they were attacked by a mysterious black machine life-form. “Let’s go! My name is the Black King, Black Lotus!!” Going beyond time, the accelerated worlds and virtual worlds collide—.