In ancient times, the demon king Alsa, who was born out of human resentment and killing, summoned the Undead Army in the Western Continent to slaughter living beings. The Western Templar Knights formed a demon-slaying team and came to the Eastern Continent to seek the Holy Sword to seal Alsa. However, Alsa has already launched an attack in the Eastern Continent. The Western Templar Knights joined forces with the Eastern Night Patrol Mountain Palace and other martial arts sects to resist the seal of Alsa.