After combining his current health examination data with Karin's previous data, Shinji suppressed his urge to transplant the First Hokage cells immediately.
When it came to awakening the Rinnegan, haste would only lead to failure!
Besides, as long as he prepared every step properly, the goal was assured. He really had no need to rush ahead in pursuit of quick results.
Putting aside the thought of surgery, he shifted his attention to organizing the "legacy" of the Demon Slayer World.
After carefully sorting and organizing everything, Shinji confirmed that he had collected a total of thirty Breathing Techniques. These included Sun Breathing, the original Breathing Technique from which all others descended, as well as various branches created by later generations.
In addition to the Breathing Techniques themselves, there were 742 volumes on related training methods, practical experience, and insights.
Nine of those volumes covered advanced Breathing Technique states such as the Curse Mark and the Clear World. Two of the nine had even been written by Ryuhei Ubuyashiki. They summarized nearly everything earlier generations had understood, studied, and envisioned about Breathing Techniques, while also including his own views. They were extremely valuable reference materials.
He hadn't even needed to fully absorb all this information. Just giving it a rough review had already benefited him considerably. Combined with the Medical Ninjutsu system he had mastered, it gave him a much clearer path toward optimizing Breathing Techniques.
"The swordsmen never developed Breathing Techniques to their full potential." After a pause, he continued thinking, That isn't their fault. Their bodies simply can't support further development. Just awakening the Curse Mark is enough to make even their most talented members die young. But I'm different.
Shinji knew his own advantages well.
Chakra gave shinobi far greater vitality than swordsmen, and Medical Ninjutsu gave them