In the near future where the boundaries between technology and humanity are gradually blurring, Lin Xia, a modified person numbered "07", wakes up from an abandoned laboratory. What beats in her chest is not a heart of flesh and blood, but a "mechanical heart" embedded with a blue energy core - this core created by the mysterious organization "The Creation Society" not only gives her speed and strength beyond ordinary people, but also makes her lose all memories of the past, leaving only the instinctive alertness to the sound of metal friction.
When the city was swallowed up by the out-of-control combat-type AI "skeleton swarm" and high-rise buildings collapsed in laser and artillery fire, Lin Xia discovered that her mechanical heart could resonate with the core of the skeletal swarm and even cut off their control signals. She was taken in by the resistance organization "Starfire", codenamed "Blade", and became humanity's last line of defense against the skeletal swarm. Every time he swung his knife to cut off the metal body of the skeleton group, the mechanical heart would feel a scorching tremor, and occasionally it would flash back to broken images: a white lab coat, a document with "Forbidden Fusion" engraved on it, and a girl with the same blue eyes as himself.
