A young boy stumbles across a cosmic mystery that threatens not only his life, but the fate of the world, in STEEL ANGEL KURUMI. Made with alien technology for military use, the Steel Angel is a mysterious and dangerous creation whose ultimate purpose is known only by a select few. However, when a young boy accidentally awakens the Steel Angel Kurumi, he becomes her master. As he begins to unravel the mystery of her creation, the young boy also provokes the wrath of her creators, who begin to activate new Steel Angels in order to destroy Kurumi.