Nakahito Kagura and a few friends of his decide to investigate an abandoned house. Since Nakahito's family has a history of magic, they decide that Nakahito should go with them to take care of the rumoured mad-scientist living there.

Dr. Amagi attempts to coerce Dr. Ayanokoji into working with the Japanese military. Meanwhile, Amagi mistakenly grabs Nakahito and Kurumi has to rescue him.

A new character by the name of Dr. Brandow joins the Imperial Army, even more interesting is it seems as though he has been previously part of the Steel Angel Project. Meanwhile, Nakahito must now become accustom to rude awakenings, while Dr. Ayanokoji is convinced the Imperial Army will not be able to awaken the second Steel Angel prototype.

The Imperial Army's preparation for the second Steel Angel's completion draws closer. Meanwhile, Nakahito finds himself haunted by the words of Dr.Ayanakoji stating that only Nakahito has control over Kurumi.

As Kurumi finds herself forced into battle with Saki, she hesitates, giving Saki the upper hand. In an effort to help, Nakahito seems to just make things worse and discovers that his words put Kurumi in this dilemma. As the fight continues it seems as though no one can help against the wrath of Saki. What will be the final outcome?

With the kidnapping of Dr. Ayanokoji it seems that in return a new (and unexpected) member has joined in his place. Meanwhile, Saki quickly redeems herself as she helps to rebuild what she had at one point destroyed.

The group"s trip to Izumo comes to a halt when Nakahito gets a stomachache. Meanwhile, Kurumi, Nakahito, and Amagi go see a doctor, but this doctor isn't your normal kind of doctor.

A large boulder is blocking the path of the train to our comrade’s destination, Dr. Amagi searches for other transportation while the army tries to remove the boulder. Meanwhile, Nakahito learns more about Dr. Ayanakoji's past from Dr. Amagi.

The group spends the night at a fireworks festival, but the sparks really fly when Nakahito is kidnapped and Kurumi sets off to find him.

Kurumi finds herself fighting Nakahito's kidnappers, the Steel Angels Kaga, Tsunami, and Kaori.

A couple of incidents get Kurumi thinking that there is something going on between Nakahito and Saki.

Kurumi, Nakahito, and Dr. Amagi go to Kyoto to find Saki, who is beaten badly by another new Steel Angel, Karinka.

Kurumi fights Steel Angel Karinka. Can Kurumi's Mark II Angel Heart prevail over Karinka's two hearts?

Karinka disguises herself and tries to find out Kurumi's secret.

Karinka finds herself working as a waitress with Kurumi and Nakahito in an effort to find out the secret to Kurumi's power.

Karinka's new goal is to get a kiss from Nakahito so that she can become more powerful than Kurumi.

Kurumi and the gang finally arrives in Izumo, where they learn many secrets about Dr. Ayanokoji. Also, Nakahito meets a young boy...

Mikhail tells Nakahito about the potential danger of Kurumi's Angel Mark II Heart.

Kurumi, Saki, Karinka, and Dr. Amagi arrive at the Academy Base to rescue Nakahito. However, the Steel Angels fall into the Academy's traps, and Dr. Amagi meets face-to-face with Dr. Walski.

An angered Kurumi continues her search for Nakahito, but she runs into and fights Steel Angel Mikhail.

The battle between Kurumi and Mikhail continues. However, Kurumi is being consumed by demonic energy to the point that she grows black wings.

After beating Mikhail, the demonically possesed Kurumi attacks dr.Walski's base!

Kurumi (in demon possesion) attacks the academy base, the damage is fatal. In order to stop Kurumi, all the steel angels drain themselves to the point of de-activation to power the ultimate weapon to stop Kurumi's destructive powers.

Nakahito makes one final attempt to stop Kurumi from destroying everything.