Spun off from the television serial with the same title, the story begins with Mr. Isayama pointing a gun at his beautiful wife as she arrives home and enters the door. The wife was a secret agent who his this little from fact from her dear husband. Then again, he was a special agent posing as a technology worker himself. It seems marital bonds and co-habitation were not necessarily ingredients for honesty and sharing of information between husband and wife.
—aghaemi