During Japan's Taisho Era (1912-1926), a scientist named Ayanokoji developed the Steel Angel - an artificial humanoid with superhuman physical abilities. While the Imperial Army wanted to use the Steel Angel as a new means of modern warfare, Ayanokoji wanted his creation to be a new step in the future of mankind. Thus, he defied orders from the Army and secretly made the Steel Angel codenamed "Kurumi". Then one day, a young boy named Nakahito Kagura snuck into Ayanokoji's house as a dare by his friends and stumbled upon Kurumi's lifeless body. A sudden attack by the Imperial Army shook the house, causing Kurumi to fall on Nakahito. At that moment, their lips met, and Kurumi woke up from "the kiss that started a miracle".

[Source: Anime News Network]

Four additional short stories of the Steel Angels: Saki becomes a film actress, Karinka goes on a blind date with Kamihito, Kurumi practices the art of becoming a traditional Japanese woman, and the rest of the Steel Angels engage in a contest to win Nakahito's heart.

[Source: Anime News Network]

Taking place 75 years after the first series, Steel Angel Kurumi 2 brings the Steel Angels in a new mis-adventure. High school student and aspiring cellist Nako Kagura accidentally discovers and kisses Kurumi Mk. II at her home, thus making her Kurumi's master. But things go awry as Nako's best friend Uruka gets jealous and tries anything - including her father's army of top-secret mecha - to destroy Kurumi and win back Nako. Things get more out of control when Saki Mk. II is awakened by Uruka, and Karinka Mk. II joins in to steal Nako away from Kurumi.

[Source: Anime News Network]

Sometime in the distant future, Kurumi, Saki and Karinka share an apartment with another girl named Excelia. One day, after school, Kurumi tells everyone that she is in love with a man she met named Michihito Kagura, but she doesn't know when she will see him again.

[Source: Anime News Network]