The high school student and aspiring cellist Kagura Nako accidentally discovers and kisses Kurumi Mark II at her home, thus making herself Kurumi's master. Things go awry as Nako's best friend Uruka gets jealous and tries anything to destroy Kurumi and win back Nako. Things get more out of control when Saki Mark II is awakened by Uruka, and Karinka Mark II joins in to steal Nako away from Kurumi. [Set 75 years after the first series. A new chapter in the story of the three female androids.]