When the rifts from other world came. Monsters appeared and one by one came out of the rifts. Spewing chaos into the world in which called Earth and almost half of humanity was wiped out.
The novel readers or cultured ones thought that there will be Systems or Global awakening next but there wasn't. No Systems, no Global awakenings, no powers nor magic. Only to rely in primitive Technology.
With the rise of the monsters, the technologically advanced army with battle suits defended and slaughtered monsters. Slowly taking back the places that the monsters have made their foothold. In which once was ours.
Then our MC named Renji which was an inventor. Made great contributions to the advancement of the gadgets and technology itself. To fight the monsters that flooded the Earth. But he was not contented. He was crippled and his sickness was incurable. He wanted to fight too! Even with the technology they have, he was still not able to figure out his sickness.
When suddenly, he woke up in the past where he was still able and could walk! To think of it, he was still schooling in the Training Corps Academy and with his knowledge of the future. What could he change in this timeline!? With that, his dream of fighting in the front lines will come true.
