"Steel Angel Kurumi Encore" is a two-episode OVA sequel to the original "Stein Angel Kurumi" series, set in an alternate Taisho-era Japan where advanced technology coexists with traditional culture. The story continues the adventures of Kurumi, a Steel Angel—a highly advanced android powered by a mystical energy source known as the "Absolute Angel System." Kurumi is fiercely loyal to her master, Nakahito Kagura, a young boy who awakened her and formed a deep bond with her.

The narrative begins with Kurumi and Nakahito living a peaceful life, but their tranquility is disrupted when a mysterious new Steel Angel named Karinka appears. Karinka claims to be Kurumi's sister and seeks to challenge her in combat to prove her superiority. Despite Kurumi's reluctance to fight, Karinka's aggressive tactics force her to defend herself and Nakahito. The conflict escalates as Karinka's true motives are revealed, intertwining with the broader mystery of the Steel Angels' origins and their connection to the Absolute Angel System.

Throughout the OVA, the relationship between Kurumi and Nakahito remains central, highlighting themes of loyalty, love, and the complexities of artificial intelligence. Supporting characters, such as Saki and the eccentric Dr. Amagi, provide additional depth to the story, offering both comedic relief and insight into the technological and mystical elements of the world. The plot balances action, humor, and emotional moments, culminating in a resolution that reaffirms the bond between Kurumi and Nakahito while leaving room for further exploration of the Steel Angels' universe.