Koutetsu no Łucja

In Poland, a steam-based nation, technology has been integrated in combat. Knights don steam armor and compete in a steam armor martial arts competition for the title of knight king, a symbol of strength. Lucja also takes part using steam armor on her arms, competing to test her strength. However, Lucja is different from the other knights as she doesn't use a weapon. Using only her fists, she shows the strength of her blows to reach the pinnacle of knighthood.

(Source: Leed-sha, translated)