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After his computer is infected with a virus, by his self-proclaimed rival Nanbara, a package appears at computer programmer Satome Kazuya's doorstep the next day. The package contains a 12" tall Cyberdoll named May.

After telling May to stay in the apartment, Kazuya goes off to school. Later, Nanbara calls Kazuya's apartment only to hear a woman's voice on the other end, and soon tries to sabotage the relationship he believes Kazuya is having with a secret woman. Also, another Cyberdoll named Sara has come to collect the bill for May. [1,450,000 Yen]

Sara, after having trouble collecting the payment for May, sends for another Cyberdoll to get the payment, or get May back.

Cyberdoll Kei, sent by Sara pretends to be a fellow AI researcher, to meet with Kei. After they meet, she is amazed by the emotions May, a Cyberdoll displays towards him.

Kazuya finally realizes that he can never afford to pay for May, so he must give her back. So, on their last day together Kei and May spend the day at an amusement park so that they can enjoy the time they have left. After May is gone, "Cyber X", an apparent android shows up at Kazuya's apartment and makes him an offer...

After May returns, Kei starts work as a lab assistant at the university. Later, everyone goes to the annual fireworks festival, where Nanbara meets the now full-sized May, and immediately falls in love with her.

Cyberdoll Mami arrives, and soon arranges a "marriage mixer." Later, Mami again tries to make a match by having Kazuya and May go shopping together, alone. But Mami visit is not just for leisure, she soon reveals that May and Kei's time together may be cut short again...

The characters work to protect the ladder between Kazuka's apartment and Kasumi's room from a terrible typhoon. We also discover more of Kasumi and Kazuka, and their relationship...

"Commando Z, the wandering president of Cyberdyne," mysterically appears, and has come to discover why a potentially fatal 'virus' is afflicting all of the Cyberdolls, except for May...

In the series finale, it is discovered that the deadly Cyberdoll virus was created within May when she was converted from 1/6 scale to full size. "Commando Z" reveals himself to be a time-traveler from the future to dicover the virus' origins and stop it before it destys all the Cyberdolls. Since May is immune to the virus, she volunteers herself to be infected with it to allow further study on the virus and a possible cure. But everyone is worried that May may not make it out alive...