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. But things go awry as Nako's best friend Uruka gets jealous and tries anything — including the use of her father's army of top-secret mecha — 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.

Source: ANN

Note: Set 75 years after the first series. A new chapter in the story of the three female androids.

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Alternative setting: Koutetsu Tenshi Kurumi Zero
Alternative setting: Koutetsu Tenshi Kurumi
Prequel: Koutetsu Tenshi Kurumi Encore