Zaizen and the Factory turn on STN-J. Karasuma is taken by the Factory. Michael, Kosaka, and Hattori decide to join STN-J hunters to move against Zaizen. They cut off the security system from the STN-J office to Factory and investigate Zaizen to track down his activity. Soon after that, Solomon Headquarters does an immediate transfer of an imprisoned scientist from Japan to Solomon Headquarters in Europe. Zaizen begins his plan to abduct the scientist to use him for perfecting the Orbo. STN-J successfully defeats the Factory, but the scientist dies at the battle scene. Before his last breath, he mistakes Robin as "Maria" and then after realizing his mistake he says a mysterious line calling Robin "the devil's child."

The final episode uncovers the origin of Project Robin. It is here that Amon and Robin confronts Zaizen in a final showdown to uncover the truth behind Todo's project. The episode ends off with the Factory destroyed, and most of the STN-J escaping unharmed. The only exceptions are Amon and Robin who have either escaped or been killed in the resulting collapse of the Factory. At the ending, the reactions of the various other characters hinted at them being alive but are said to be dead for their own safety. After the ending song, there is a scene in which a woman wearing similar clothes like Robin comes out of a taxi as a new hunter for STN-J.