"Akatsuki/En-Eins" is set in an alternate Japanese Imperial year, Koki 266X A.D. (200X AD in Gregorian year) up to 20XX AD, involving several characters that resemble the Nazi and soldiers of the World War II era and a bit from Norse myths, among others. In-game visuals supplement this sort of specific militaristic theme and environment, portrayed by the flat and somewhat cubist character portraits and story sequence images. Blitzkampf is also a follow-up to a previous SUBTLE STYLE release from 2003 called "Akatsuki Shisei Ichigō", involving many of the characters from the previous game.