Mechadon, who went to investigate Yamakawa Dam, found Yamata no Orochi. Hiroshi will face General Flora, who has been fighting with the robot beast Doran, using the new weapon marine parts. At that time, Mimashi was revealing the truth of Himika's death to Ikima and Amasso. The Haniwa army took advantage of Flora's absence and rebelled against the Dragon Demon Emperor and forced him to abdicate!