Dragon Rebellion are a pair of mechanical iron greaves that are used and worn by Katsuragi in the Senran Kagura series. They first appeared in Senran Kagura Portrait of Girls and have appeared along side her ever since.
According to Senran Kagura 2: Deep Crimson, they were left behind by Katsuragi's parents before they left her when they became renegades.
Dragon Rebellion are a pair of iron greaves with a black finish and gold trim. They are adorned with blue ribbons, similar to the ones Katuragi wears in her hair. The fasteners also have violet trimmings on them and the soles of the greaves have an ornate pattern etched into them.
Besides being very powerful kicking weapons, Dragon Rebellion are mechanical and able to transform The soles open up, letting out a spinning blade and hook. Seemingly by focusing her energy through her greaves, they create small whirlwinds allowing Kasturagi to the levitate herself and propel herself forward and in the air.