I Achieved Peaceful Deterrence in the World of Giants

Armin traveled through time and became Armin in Titan, "What? I became Armin? And I also awakened the auxiliary system?" In the original world, Eren unleashed the Earth Cry, wiping out 80% of the human race. This time, as Armin, I must make up for all my regrets. Karula? Give me a life, Giantess? Catch it for me in advance, Kaiju and super jumbo? Sorry guys, just be part of my plan to achieve peaceful deterrence. Eren and Mikasa? You two, please give me a good marriage post. Let me be the savior of Pa Island this time. Note: This is a derivative fanfic. The first part will have some overlap with the original work, but later on, I will start to write an original plot. The protagonist of this article is stubborn in the early stage, but comes out in the later stage, trying his best to make up for the regrets of the original work. I have everything you want to see.