Chapter 3
Along the way, Saitama held tightly to the scroll labeled Chakra Refinement Technique.
In the world of shinobi, what separates a ninja from an ordinary person?
The answer was clear to Saitama: Chakra.
To him, chakra was the very boundary between the mundane and the extraordinary. Without chakra, you're just a civilian. With it, you're something more.
But where does chakra come from?
According to the scroll, and from what Saitama could recall from his previous life, chakra was composed of three elements:
1. Physical energy, produced by the body's cells.
2. Spiritual energy, strengthened through experience and training.
3. Natural energy—a rare and dangerous power drawn from nature itself, which was beyond his current reach.