The story of 'BLOOD Oath of Silence' unfolds in a dark and action-packed science fiction atmosphere. There are two main characters:

Erna: A strong but wounded woman with a painful and flawed past, who was expelled from the army for disciplinary reasons and now works as a bounty hunter. Although she is initially motivated by money, she gradually transforms into a protective figure due to her conscience and past losses.

Ilya: Though he appears to be a child, he is actually a mysterious entity. He possesses an extraordinary biological power known as 'Crimson Blood.' His wounds heal without bleeding, and over time, he begins to control supernatural energies. These abilities make him the 'key to eternal life' for both the empire and criminal organisations.

The story follows Erna's journey to find Ilya, which unexpectedly turns into a battle to protect him. While clashing with ruthless bounty hunters and rivals like Silas Vane, Erna also faces off against the Syndicate, an organisation that secretly controls the galaxy. Lira Vex, Erna's old friend from the past who is now her enemy, adds a dramatic 'sibling rivalry' dimension to the story.

Overall, the story blends intense action sequences with emotional inner conflicts. The atmosphere is dark and cinematic; each character carries the weight of their past. 'Crimson Blood' is not merely a biological power but also a symbol of fate, hope, and war.