After binding an owner contract with Arato, Lacia has come to live with the Endo's. Arato's sister Yuka has completely accepted Lacia, and even enters her into an hIE modeling audition. Meanwhile, Arato can't hide his apprehension with living with someone who looks to be a beautiful girl his own age.

Lacia has a new modeling gig. It is an image commercial to promote a new type of relationship between hIE's and human beings, one in which people view hIE's of the opposite sex as an equal partner.

Kengo is arrested by the security police in connection to Kouka's terrorist activities. Arato decides to save Kengo and gives Lacia the order. Following the plan she has devised, Arato finds himself face to face with the PMC “HOO,” the military group responsible for destroying Kouka.

Super intelligent AI have spurred society to change. As the fight surrounding Arato and Lacia escalates, the leaders of the old guard discuss how they could maximize their own profits. Among the participants, only Erika Burrows expresses anger towards their foolishness.

Snowdrop appears in the underground facility as some sort of hybrid between bird and person, a strange new creature created by a super intelligent AI which no longer needed humanity to exist. Lacia attempts to hack the cloud system that stores hIE behavior controls in order to stop Snowdrop. Her efforts would determine the outcome of the entire human race.