Developed by Dr. Tenkuji, the android Machiner continues her battle against the robots created by the evil scientist Zilva. Her body contains a special circuit known as the Heart System, which triggers intense pain whenever she harms a human. Since Zilva's robots have human brains implanted within them, this becomes a critical weakness for Machiner. Fearing the reality of transforming into a fully mechanical being by removing the Heart System, she rejects her son Mitsuo's proposal to deactivate it. As a result, she chooses to continue fighting... [BAD END]