The Underground Mechanical Beast, Holzon V3

Synopsis

Cities and industrial complexes were being destroyed one after another by frequent, unexplained ground subsidences. To Professor Yumi, who was concerned about the situation, a warning arrived from Dr. Hell: if he didn't surrender his position as laboratory director, the ground subsidence would spread nationwide. Professor Yumi, concerned about the harm to the general public, decides to hand over the Japanium as demanded. However, the item the professor handed over to Baron Ashura was a fake, secretly swapped by Professor Nossori.