Choukou Sentai Justice Blade Zero ~Daishuryou no Teki wa Daishuryou~

After the shocking twist at the end of Justice Blade 3, the Great Leader, Dark Jade, lost his mask and memories.
Now, in an alternate version of Japan where Dark Jade continues to scheme in the shadows, a new threat looms.
Who is the True Great Leader, the mastermind behind Dark Jade’s reign?

To counter their menace, advanced technology from another world is being analyzed to develop the ultimate weapon: the Hyperlight Squadron Justice Blade, a team of warriors designed to annihilate Dark Jade.
However, their power relies on the Blade Suit, which can only be worn by those with a special trait called the JB Factor.
Meanwhile, the protagonist—stripped of his mask and parts of his memory—is unexpectedly recruited as a support member of the Justice Blade team.
Will he regain his lost power and memories?
The great leader's new battle begins...

[Translated from dlsite]