At the secret base downstream along the Naka River, a test of intellect and perseverance lasting nearly a hundred days had just drawn to a close.
Shinji Uchiha stood before the others. The blackboard behind him no longer held a jumble of symbols, but two clear diagrams of the core framework. One depicted how Mental Energy and physical energy intertwined like a double helix, resonated, and ultimately underwent a qualitative change into more active chakra. The other showed a network of pathways for optimizing and regulating that "double helix" according to each individual's traits.
"A hundred days of work have borne fruit today." Shinji's voice was calm, yet carried the weight of having reconstructed some fundamental law. "What we have deconstructed is not chakra alone, but the double helix at its source—Mental Energy and physical energy."
Throughout this "hundred-day chakra research campaign," Shinji had used his exceptional project management skills to steer their research precisely toward the fundamentals of chakra composition.
Shinji had first laid out the core hypothesis: "The quality and quantity of chakra depend on three major variables: the strength and purity of Mental Energy, or 'spirit'; the reserves and activity of physical energy, or 'body'; and the efficiency and conversion rate of their combination, or 'fusion.'"
"Every training method is merely a different emphasis or combination of these three."
On that basis, the research had naturally divided into three parallel tracks:
First came the path of deepening Mental Energy, the path of spirit, led by the Mental Strength team: Hizashi Hyuga, Torayoshi Uchiha, Shikaku Nara, and Inoichi Yamanaka.
Hizashi's Byakugan became a microscope for observing how "spirit" affected the process of "fusion." He could clearly see significant differences in the "brightness" and "fluidity" of the chakra produced when the two energies combined under different mental states.
Inoichi