Seventy-five years later, Steel Angel Kurumi 2 unfolds a fresh escapade with the Steel Angels. When high school student Nako Kagura stumbles upon Kurumi Mk. II and inadvertently becomes her master through a chance kiss, chaos ensues. Nako's closest friend, Uruka, fueled by envy, unleashes her father's clandestine army of mecha in a bid to eliminate Kurumi and reclaim Nako's affections. The situation spirals further as Saki Mk. II is roused by Uruka, and Karinka Mk. II joins the fray, scheming to snatch Nako from Kurumi's side.