After one last desperate attempt to defeat the natural enemies driving humanity towards extinction, thirteen worlds have collided and brought their people together...along with their natural enemies. The Hero Hallow of Sorcerion and his companions, along with the Mecha Ordinance's Commander Keila and her team, suddenly find themselves driven into a corner by the combined forces of their enemies, the demons and the robots. Until, by a strange twist of fate, those enemies started fighting each other. With thirteen natural enemies knocking down their doors, the remnants of humanity stand no chance...unless they can trick those enemies into destroying each other...