Koutetsu Reiiki: Steeldom (also known as just "Steeldom") is a third-person arena-based action game and a follow-up to Reverthion by the same developers. It plays very similarly to Sega's Virtual On, and includes eight playable characters each with their own unique moveset and abilities. There is a single-player campaign with unique endings for each character, as well as a 2-player split screen versus mode; the Saturn version adds system link support for two-player matches between two consoles.

In the aftermath of a great supernatual war, one of the few forms of entertainment is a fighting tournament between users of "Ryoga", a mystical power that manifest souls as a suit of mechanized battle armor. Eight warriors enter the tournament; some seek fame and fortune, some seek a better life, and some simply fight for the thrill.