Is the robot on the cover actually MH the Empress of Flames?
I like the part about the MC (in the form of a young girl) meeting the 'mad scientist' and the scientist's first designed Fatima, Queen, and how the trio encountered Mad Max, the strongest knight/Juggernaut (?) in the whole Joker Cluster.
I think starting from vol. 4 and 5, the author really got his free spirit going with his Sci-Fi tales of knights and maidens.