Second World - Chapter 12 - 12. Cat And Mouse Through The House

Explore the Universe through the hardest, truest weapon: the Fist.

Jack Rust was a disillusioned biologist with a PhD—almost. When an extraterrestrial AI calling itself the System invaded Earth and thrust it into a world of aliens and violence, the least Jack hoped for was magic. Unfortunately, the System decided to spawn a forest dungeon around him and a goblin in his face, which left him little choice.

Armed with nothing but his fists, Jack must grow strong enough to survive entire menageries of monsters. He needs to return to civilization and find out what the hell is going on. He might also get magic—or not. Surprising himself, Jack discovers that violence is fun.

In this battle-ridden new world, Jack finds the life he always dreamed about. He won’t just survive. He will thrive.

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Amid a world war, with his awakening to powerful special abilities (Soul Armor Abilities), Kamiya Yuusuke, conscripted into the military at the age of 10 due to this newfound power, continued to achieve numerous victories on the challenging battlefield. As a result, at the age of 15, he held the position of Brigadier General.Despite traversing battlefields worldwide, he finally managed to return to Japan. The joy of returning home was short-lived, as news of an underage boy in the military started to leak to the public. In response, the military high command ordered Yuusuke to attend a military school called the Special Operations Soul Armor Academy and undergo a revision of his military records.Yuusuke, secretly pleased at the prospect of reclaiming his youth, faced numerous troubles, whether due to the nature of the unique school or perhaps because he had been in constant battle since childhood. What will happen to his relationships with strong-willed girls such as his half-silver-haired childhood friend, the older sister officer who is his work partner, and the tsundere honor student of the same age?

An Individual from Earth finds themselves in the Shinobi World, equipped with a Scientific System. From that moment, he delved into scientific research far ahead of its time.