"Steel Angel Kurumi 2" is a four-episode OVA series that serves as a sequel to the original "Steel Angel Kurumi" anime. The story is set in an alternate version of 20th-century Japan, where advanced technology coexists with a retro aesthetic. The narrative centers around Kurumi, a Steel Angel—a highly advanced android designed for combat, who possesses a core powered by a mysterious energy source known as the "Angel Heart." Kurumi is fiercely loyal to her master, Nakahito Kagura, a young boy who awakened her in the first series.

The sequel begins with Kurumi and Nakahito living a peaceful life together, but their tranquility is disrupted when a new threat emerges. A rogue Steel Angel named Saki, who was created by the same scientist who designed Kurumi, begins wreaking havoc. Saki is driven by a desire to prove her superiority over Kurumi, leading to a series of confrontations. Meanwhile, Nakahito and Kurumi are joined by Karinka, another Steel Angel who initially appears as an antagonist but later allies with them. Karinka’s presence adds complexity to the dynamic between Kurumi and Nakahito, as she harbors feelings for Nakahito and challenges Kurumi’s devotion.

The plot explores themes of loyalty, rivalry, and the nature of artificial intelligence. Kurumi’s unwavering dedication to Nakahito is tested as she faces Saki’s relentless attacks and Karinka’s emotional interference. The series balances action-packed battles with moments of humor and lightheartedness, maintaining the tone established in the original series. The climax involves a high-stakes battle where Kurumi must confront Saki to protect Nakahito and prove her own worth as a Steel Angel.

The main characters include Kurumi, whose childlike innocence and immense power make her a compelling protagonist; Nakahito, whose role as Kurumi’s master anchors the emotional core of the story; Saki, the antagonistic Steel Angel driven by jealousy and ambition; and Karinka, whose evolving relationship with Kurumi and Nakahito adds depth to the narrative. The series concludes with a resolution that reaffirms the bond between Kurumi and Nakahito while leaving room for further exploration of the Steel Angels’ world.