Osamu is a broke day laborer barely surviving Tokyo’s underworld—until crossing the wrong gangsters costs him his left hand. Left bleeding and broken, he’s rescued by his ex, Koyuki, who leads him into the city’s neon-lit underbelly and into the hands of an underground surgeon. The transplant saves his life... but the new hand has its own blood-soaked agenda—to finish what Osamu started. Now, Osamu’s not just out for revenge—he’s a passenger in it.