Anything could only be used and mastered once it had been observed. Take souls, for example. In Uchiha Kazuto's original world, no one even knew whether souls existed. They were nothing but fantasy, so how could anyone make use of them?
Unlike the Ninja World. Here, souls could truly be observed. There were even Ninjutsu that dealt directly with souls.
In Uchiha Kazuto's eyes, in a world where souls were known to exist, the death of the body didn't count as true death. Only the destruction of the soul was real death. Otherwise, what people called bodily death was merely the soul moving somewhere else to continue existing.
Just as in worlds with a system of reincarnation, from the perspective of the soul, no one had ever truly died. They were merely a group of immortal souls endlessly reincarnating. Even from the perspective of personality, no one was ever truly gone, because those worlds believed in the awakening of past-life memories.
After that, Uchiha Kazuto arrived at the newly established Konoha Ninja Vocational Technical School. Not much time had passed since he issued the order, but the school was already taking shape.
The construction workers would have wept in despair at the speed of the work.
But this was perfectly normal. Ninjutsu was just that convenient. All it took was a few techniques to raise towering buildings from the ground.
At that moment, a group of students were undergoing physical training under their instructors. The idea was to cultivate their Loyalty. They called it physical training, but really, they tortured the students as much as they wanted. As long as they didn't die, they could be tortured without restraint. This way, the students' Loyalty would increase at an astonishing rate.
Of course, they didn't train around the clock. They still