Ye Chen was adopted as a child by the Sect Master of the Northern Continent Sword Sect. On the day his swordsmanship reached perfection, his master was murdered. Armed with nothing but his sword, Ye Chen sets out alone for the Central Continent, vowing to avenge his master. However, he accidentally uncovers the truth behind the great war between humans and demons a thousand years ago. With the Demon Emperor reappearing in the world and humanity facing an existential crisis, Ye Chen steps forward, leads the powerful warriors of the human race against the demons, and swears to protect all living beings with his life.