Kouji and his friends have defeated Dr. Hell and are now enjoying a break, but suddenly a strange prophet appears and warns everyone of an oncoming danger, mechanical beasts never seen before start appearing all around the world wrecking havoc. Its up to Kouji and his Mazinger Z to stand up to this threat but it seems he is vastly outnumber and outmatched.

Amsterdam, June 12, 1942. Anne celebrates her 13th birthday and begins her diary, which she calls Kitty. Hiding for two years from the German threat, the young girl writes about her idealistic views on the world, her ambitions, her fears and her first love, Peter.