Manga The Secret Land (2021-)

Hitler's dead. Ben and Katherine are supposed to be together, happy. Instead, Ben fights the war in the Pacific with the reckless heroism of one who believes his fiance killed in action. Yet, Katharine lives, undercover and about to arrive at the Third Reich's last bastion. Something is waiting for her there, for all of them, and it is hungry. Cosmic horror from the creators of The Whispering Dark.