I Transmigrated to World War II and Became a Beautiful Girl

Summer, a college student, accidentally transmigrates into the game Hearts of Iron IV. The game happens to be starting in 1936, and the System tells him that to stay alive and avoid being erased as a bug by the order of time and space, he must keep changing history, twisting the timeline, and accumulating temporal deviation points. To survive, and to carve out a place for himself in the game world, he must become the girl Elena and set the course of history in turmoil.