Oath of The Blood

In a world where a mysterious power called "Oath" is hidden by the government, a young boy named Dai loses his father in a tragic attack, while his mother and unborn sibling disappear. Driven by vengeance, Dai vows to avenge his father's death and find his family. His grandfather, also an "Oath" wielder, trains Dai for 16 years. As an adult, Dai begins his journey. Along the way, he finds a clue that his father's killer is a "ruler" protected by a group of powerful "Oath" wielders. Realizing he cannot fight alone, Dai continues his journey to gather strength and allies to face an enemy that is a large organization connected to the government.