Chizuko Mikano is living with her aunt and uncle who are slowly poisoning her. However, her sharp intuition allows her survive long enough for the thief Twenty Faces, by chance there to steal the Anastasia Ruby, takes her away to join his band of thieves. They escape from the police in a car and are then ambushed by Tiger, who they shake off by escaping in the airship and heading toward an island.

Chiko helps out with the domestic chores of the thieves, including cooking meals. Twenty Faces arranges for the group to explore and recover something important from a sunken underwater fortress, only for the submarine captain to betray them. However, by overlooking Chiko, the captain and his crew find themselves at the mercy of Twenty Faces instead.

Chiko uses an movie shoot as an excuse to visit "White Hair Island", where she may find information regarding Twenty Faces. Upon entering the island, Chiko spots Ken whom she had thought dead. Later, when the two get a chance to speak to one another, Ken reveals that he blames Twenty Faces for all the misfortunes that have befallen him after his "death". A man is murdered on the island, and Chiko decides to investigate the occurrence. Chiko is captured by a mysterious white haired person, who reveals that he wants to find and kill Twenty Faces. The "White Haired Devil" moves to kill Chiko, however Ken arrives and manages to stop her. It becomes obvious that the "White Haired Devil" is not susceptible to injuries, however manages to trap her. Ken quickly disappears, and Chiko and Shunka then return home.

Chizuko, Ken, and Dr. Kayami Head towards the tower to stop Kohei and meet up with Twenty Faces. When almost there, the genetically enhanced children fire a rocket at the airship. Chizuko hops off onto the tower, while Ken and Kayami crash land onto the roof. As Ken and Kayami fight the children formulating a plot to defeat them, Twenty Faces appears in the control room of the tower, where he meets Kohei. Twenty Faces shoots Kohei between the eyes, but to no avail. It is shown that he has created himself an artificial body, using the White Haired Devil's research. During their dual, Twenty Faces burns Kohei revealing that he made himself look just like Twenty Faces. When it looks grim for Twenty Faces, Chizuko shows up. After a brief conversation, Chizuko declares herself to be Twenty Faces daughter and vows to defeat Kohei. Though at first it appears she has a chance, this is quickly dispelled as he overpowers her. Forcing her to push the lever which re-initiates the Fourth Phase of Water weapon, the weapon goes fires.