In the deepest shadow of the Republic, stands a non-existent school - the "Shadow Niche". It does not recruit civilians, and its students are the blood of the country's core power elite. What is forged here is not students, but the sharpest and most secretive blade of the country's will. An orphan codenamed "Blade Seven" was admitted under special circumstances because of his extraordinary fighting instincts, but was sentenced to death for teamwork. Six years of inhuman training has polished him into a lonely sharp blade, walking on the edge of war ethics and human nature. When the final test throws him into a deadly whirlpool across the continent, facing the betrayal of his seniors, the super weapon that annihilates humanity, and the cold control from the deepest part of the "Shadow Niche", "Blade Seven" must make a choice between becoming a machine of destruction or regaining the lost "humanity". Is he a guardian in the shadows, or a spark about to ignite the world?
