"Now I'm going to destroy your shadow clones. If you can't hold on, tell me immediately," Tsunade said as she looked at the courtyard full of clones.
"Got it," Uzumaki Rin nodded.
Tsunade was testing his endurance—specifically, how much feedback from the shadow clones' experiences he could withstand.
Boom!!!
With a single punch, Tsunade shattered ten shadow clones around her. They burst into smoke and vanished instantly.
At the same moment, Rin felt a heavy pressure in his chest, as if he had been struck. It was extremely uncomfortable. Fortunately, the life force within his body circulated rapidly, restoring his cells in an instant.
Boom!!!
Another kick, and more than a dozen clones disappeared.
This time, Rin felt discomfort throughout his body, but it quickly subsided as well.
Boom! Boom! Boom!
After observing him and seeing that her attacks caused almost no burden, Tsunade stopped holding back and launched a barrage of strikes.
In an instant, dozens of clones were destroyed.
This time, Rin finally felt pressure.
At the moment the clones were shattered, it felt as though his cells were being crushed—but in the very next second, the life force within them erupted, neutralizing the damage.
Sensing the surge of life energy, Tsunade immediately appeared beside him with a Body Flicker.
To her surprise, Rin was completely fine.
Not only that—each time the damage transferred from the clones to his body, his cells unleashed even greater potential. It was essentially a form of training.
At this point, Tsunade had nothing more to say.
The Sage Body was simply absurd.
"Tsunade, I'm fine. Keep going. I want to know my limits," Rin said.
"Hmph… don't come crying later," Tsunade replied before continuing her assault.
For the next hour, the courtyard echoed with continuous explosions.
Boom! Boom! Boom!
After an entire hour, Tsunade had no idea how many clones she had destroyed.
Yet Rin remained standing calmly.
Aside from a bit of sweat, he showed no signs of discomfort.
In fact, his cells had grown even more active under the intense pressure, and his physical condition had improved slightly.
"From now on, just train using shadow clones. I'm going to take a bath," Tsunade said, finally satisfied.
If it were an ordinary person, this level of strain would have destroyed their body. But Rin's vitality made it possible.
After Tsunade left, Rin dropped to the ground.
While his body was fine, the mental exhaustion was very real. Even his Sage Body couldn't alleviate that.
"So even with the Multiple Shadow Clone Jutsu, I can't go overboard," Rin muttered. Mental fatigue was far worse than physical exhaustion.
A few minutes later, he went inside, washed up, and fell asleep.
The next morning, he woke up refreshed.
After breakfast, he created hundreds of shadow clones.
Some practiced tree climbing, some trained ninjutsu, some sparred in taijutsu, a few went to Kushina to learn sealing techniques, and one accompanied Tsunade to study medical ninjutsu.
As for the original body—
He calmly went to school and lay down to sleep.
This time, he wasn't bored.
He genuinely needed rest.
Every ten minutes, a clone would disperse, transferring its memories and fatigue back to him. As a result, Rin spent the entire day constantly processing and absorbing the accumulated experience.
In just one month, his strength skyrocketed.
His mental energy and chakra reserves grew at an astonishing rate.
Each time a clone dispersed, the fatigue compressed his cells, forcing them to release more vitality. It was as if he was training his body continuously.
At the same time, his original body absorbed sunlight, replenishing that vitality through Photosynthesis.
This cycle caused his cellular activity and stored life force to multiply several times over.
Meanwhile, the constant mental strain refined his already exceptional mental strength, pushing it to even greater heights.
Naturally, his chakra reserves surged as well.
At this point, Rin no longer worried about chakra.
If this continued, he would eventually become something like a humanoid Tailed Beast—his chakra practically limitless.
"Rin-kun, your lunch."
At noon, Kurenai woke him up and handed him the bento she had prepared.
"Already lunchtime? Time flies… whoa—such a big piece of beef today. Awesome," Rin said, shaking himself awake as he opened the box.
"This is braised beef I just learned to make. I hope you like it," Kurenai said softly.
"Of course I like it. I'm digging in," Rin replied and began eating.
Seeing how much he enjoyed it, Kurenai smiled and started eating as well.
Over the past month, Rin hadn't just been sleeping in class.
Half a month ago, he had already successfully charmed Kurenai.
In the Naruto world, children matured early. Even though they were all still kids, they already had their own thoughts.
Uchiha Obito followed Rin everywhere, full of clumsy enthusiasm. Despite his antics, Rin patiently listened to everything he said with a gentle smile.
As for Asuma Sarutobi, he no longer dared to bother Kurenai.
After being thoroughly defeated by Rin several times, he had started training diligently, hoping to surpass him one day and "win Kurenai back."
Of course, Rin had already told him that this was nothing more than a dream.
But Asuma, like Guy, was full of youthful stubbornness and refused to give up.
Kakashi, meanwhile, still wore his usual expressionless face—but it was clear he had been training intensely.
He had even started dozing off during class, a sign of overtraining.
"Kakashi! Let's have another battle of youth! This time I'll win! Once I beat you, I can challenge Rin! Come on, Kakashi!"