Known as "the most sinister dark fantasy", it describes the protagonist Kainshel's powerful revenge drama. The story takes place 20 years after the Seven Heroes sealed the dark foreign kingdom and brought peace to the empire. New riots are unfolding at the border near the Border King's territory. At this time, a border hero swordsman Kainshel suddenly appeared, using a huge black sword to punish rape and eliminate evil. His true identity is "Asherid", one of the "Traitors of the Holy Lance" who was assassinated 20 years ago after being branded a traitor. He has only one purpose: to avenge the "Seven Heroes" who were the real betrayers who killed his companions with a smile and took away the credit for sealing the dark foreign country. As times changed, the empire was restored to a stable world thanks to the glory and governance of the Seven Heroes. To assassinate them may plunge the empire into uneasy crisis again. Despite this, Keinshel continued his assassination journey.