In the winter of 1943, deep in occupied Poland, the Reich demands miracles. A secret project known as Projekt Blutkraft is forced into motion-an experiment to turn human blood into living fuel and forge soldiers who never tire.
The man at its center is Dr. Masaru Reu , a surgeon marked by the horrors of Unit 731. Brilliant, conflicted, and trapped between duty and guilt, he is ordered to perfect the serum no matter the cost. His journals reveal a mind pulled apart-clinical notes blurred with confessions, each page darker than the last. Test subjects convulse, animals tear themselves apart, and the serum's glow hints at something alive within it. When pressed to deliver results, Masaru makes a choice that no one in the bunker can undo.
Through the eyes of Anna Kovalenko, a captured nurse who secretly records her own testimony, the story shows the toll on those forced to witness the nightmare. And above them all looms a ruthless colonel-cold, calculating, and willing to sacrifice anyone to see Blutkraft succeed.
When Allied soldiers finally break into the bunker, they find corpses, scattered notes, and Masaru himself-changed, but not destroyed. His words remain: fragments of science, sorrow, and something far more dangerous.
Who was Dr. Masaru Reu -a victim of war, or the architect of his own damnation? And what if the thing he created did not die with him?