After all, his mortal body was not a Summoning Beast blessed with bloodline power. He could not cultivate this way for extended periods.
Of course, perhaps his body had yet to adapt, or perhaps there was a more perfectly compatible breathing rhythm that could avoid or lessen these aftereffects.
The cause of these aftereffects was most likely some unknown, mysterious factor in his breathing. Of course, it could also be a rejection reaction caused by his body's cells absorbing food energy.
Or perhaps it was both.
"Could that unknown, mysterious factor in my breathing just now have been Nature Energy?"
Umino Sasuke was deeply shaken, but he quickly dismissed the notion. If it really had been Nature Energy, then with his current chakra reserves and control, he would have long since been devoured by it and turned into an inanimate natural object.
"If it isn't Nature Energy, then what is it? It can't really just be oxygen, can it?"
Umino Sasuke shook his head. Unable to make sense of it, he stopped dwelling on the matter.
He was no scientist. He had no intention of pursuing the truth and getting to the bottom of everything. As long as it worked, he would use it. Who cared about the underlying principle? Once he was strong enough, he could work backward to deduce it and save himself plenty of time and effort.
After resting for quite a while, the numb, tingling aftereffects throughout his body finally began to slowly fade.
He felt as though he had regained control over his body. Just now, it had felt as if his body had been exiled from him; only now did he truly feel alive again.
Having regained control, he habitually used the Akimichi Digestive Technique to digest the food in his intestines and restore