Don't cry Kouji! The life placed in the Cross

Synopsis

One day, Koji rescues a girl being chased by the Iron Mask Corps. Her name is Erika. She has no memory, but vague fragments of information about the Mechanical Beasts linger in her mind. Taking Erika along in Mazinger Z, Koji is moved by her sensitivity as she murmurs that it was "the first time she had felt shame and the first time she had laughed." But she held a terrifying secret: she was actually a humanoid called Espionage R1, sent in by Baron Ashura. When her memory returns, Erika puts Koji in a tight spot, but...