After a short time skip, Kouji and Shiro now live at the Kurogane House and work alongside the Photon Power Lab in the fight against the mechanical beasts. However, friction has been born between Kouji and the Robot Corps, who he finds useless and has no desire to fight beside. Meanwhile Baron Ashura, eager to prove him/herself to Dr. Hell, begins a co-ordinated mechanical beast attack on Tokyo, Osaka and Nagoya. At the same time, three mysterious blonde women arrive at the Kurogane House.
あしゅら男爵が発動した日本侵略作戦により日本各地に同時に出現する機械獣。そんな時、「くろがね屋」に謎の三姉妹が訪れる。
几乎每天甲儿都为了保护热海而与地狱博士的机械兽战斗着，但是在战斗中甲儿却极不愿与同伴们合作也不愿接受大家的好意，只身一人燃烧着仇恨的火焰与敌人战斗着，面对沙也加的劝说甲儿以魔神Z是不败的为理由离开了。另一方面甲儿和士郎寄住在黑金屋中，经过黑暗寺的调查这里的员工几乎都是有过死亡记录的人。
