Immortality begins with the ninjas of Konoha.

At the end of July, the ninjas who had been replaced at the front lines and returned to the village were still on vacation.

The new poison from Sunagakure kept Tsunade busy for almost half a month, and her irritable mood only eased as the mission was finally coming to an end.

Inside the expanded herbal laboratory, Furukawa was using chakra to envelop the toxins for a new round of testing, while Tsunade observed carefully before lowering her head in deep thought.

"Sunagakure analyzed our Kyonenmaru, but they couldn't find the raw materials, so they thought of the tailed beasts."

"As expected, trouble is piling up. The Anbu have been busy searching for spies for the past few months. Remember, never show that special chakra in any situation."

Seeing that Furukawa Osamu's face was still pale, Tsunade gently instructed him that she did not want others to notice this special talent, not even the village's higher-ups!

"Teacher, I understand."

"My Hundred Healings Seal is almost complete, and I can also help my teacher with his cultivation soon."

After releasing the poison, Furukawa pointed to his forehead. Upon hearing this, Tsunade immediately showed curiosity, leaned closer, stared at his forehead, and whispered:

"Theoretically, it should be a diamond-shaped mark!"

"However, after using Yin Seal Release, your technique should be different from what I designed before."

"Speaking of which, this technique is indeed very troublesome. Most ninjas can't even control chakra and seal the seals."

Furukawa Osamu grasped Tsunade's right hand, which was about to point randomly, and was about to say some training techniques, but Tsunade shook her head:

"Secret techniques are a ninja's trump card. Although I am your teacher, there are still some information you must keep secret."

"Intelligence can be a matter of life and death at times. Remember what I said: never reveal your hand too easily."

"Survival is more important than anything else."

Perhaps because they had spent so much time together over the years, Tsunade had grown increasingly afraid of death. At this moment, she subconsciously gripped Furukawa Osamu's left hand, as if afraid that the scene in her mind would reappear.

"Teacher, don't underestimate the technique you developed! It adds a huge amount of chakra, enough to handle any difficulty."

Furukawa Osamu, with a serious expression, began to extoll the Hundred Healings Technique, but Tsunade finally laughed out loud, turned her head, and changed the subject, saying:

"Today Shizune became a Chunin! Let's go to an izakaya tonight to celebrate, it's been so long since I've had a proper drink!"

"You're already a Chunin? Time flies this year! Sensei, are you planning to leave work early?"

Tsunade waved her hand dismissively after hearing the complaints, and pulled Furukawa Osamu away. After being busy for so long, it was time for her to rest for a while.

-

Late at night, Furukawa Osamu returned home and did not take any more secret medicine. His accumulated Sage Chakra was saturated, and after his spirit merged with it, he could complete the Hundred Healings Seal.

"Master Xiu, tonight let the spiritual energy fully integrate into the Sage Chakra, achieve initial resonance, and feel the energy of nature."

"After you've adapted, we'll return to Shikkotsu Forest, where your body will help you complete the transformation of your cells."

The slug's cheerful voice came from Furukawa Osamu's shoulder; she couldn't wait to resonate with her kind.

Furukawa Osamu nodded, formed hand seals, and his spirit appeared in the Hundred Healings Seal. Looking at the "misty" Sage Chakra floating above his head, he decisively stretched out his arm.

The vast energy accumulated by [Gathering] allowed Furukawa Osamu's spirit to freely split, allowing Sage Chakra to continuously absorb it.

Furukawa Osamu lost track of how much time had passed until a figure appeared beside him. The slug transformed into a beautiful blonde girl who reminded him in a soft, sweet voice:

"Lord Xiu, you can now freely control this power!"

"Now we will complete the initial resonance, and I will guide you to feel the energy of nature."

Within the Seal of a Hundred Healers, after seeing the live slug disappear from his body, Osamu Furukawa's spirit suddenly became aware of everything outside, and the live slug's voice reappeared at just the right moment:

"This is natural energy, Master Xiu. Your body is now fully activated, and your senses have been amplified."

"A wonderful reaction; it seems my worries were unnecessary."

The slug's voice was unusually cheerful. When Furukawa was about to respond, he suddenly noticed that the Sage Chakra above was spinning and condensing, eventually turning into a somewhat illusory sphere.

"Is the split spirit automatically channeling natural energy within the Sage Chakra sphere?"

"Yes, Master Xiu, this is my job."

"Please perceive carefully. It's not just natural energy; the spirit has also connected to every cell in your body through a technique. Master Xiu is now in Immortal Mode."

Upon hearing the answer from the live slug, Furukawa Osamu formed another hand seal, opened his eyes, and then a flood of information rushed into his brain, his perception range constantly expanding.

"So this is Sage Mode?"

Power surged from his body, and his brain processed information at an increased speed. Furukawa wanted to continue experiencing Sage Mode, but suddenly felt a strange chakra.

"Celestial Technique: Submarine Navigation!"

With one hand forming a hand seal, the Sage Chakra within the Hundred Healings Seal was instantly converted, and then he vanished from the ground.

White Zetsu had just infiltrated the vicinity of the Furukawa family from the Uchiha clan's side. By the time it sensed something was wrong, it was too late. It was grabbed by the neck and hurled rapidly out of the ground while still in the mud.

The deep purple diamond-shaped mark on Furukawa Osamu's forehead was emitting an eerie glow, as if it were constantly flashing, and the purple eyeshadow around his eyes completely changed his aura.

"Who...who are you?"

White Zetsu was stunned by the fall. The Furukawa Osamu he had seen on the battlefield not long ago did not look like this, nor did he have such terrifying pressure on him.

"An interesting life form. I didn't expect you to come to my doorstep."

"Although it might disturb that old man, I need you to help me verify my guess."

Upon hearing Furukawa Osamu's words, White Zetsu wanted to flee immediately, only to find himself trapped within a barrier, so he simply got up and attacked.

"Well..."

Furukawa Osamu grabbed White Zetsu by the throat, easily subdued him, and forced him to kneel on the floor. Then, with a thought, he immediately used [Gathering] with his right hand.

"What...did you do to me?"

Bai Jue stared wide-eyed and whispered, feeling his body disappear and his consciousness rapidly fading away.

An invisible white energy appeared on Furukawa Osamu's right hand, indicating that the live sample collection went very smoothly.

"Did Lord Xiu devour this creature?"

"Yes, Live Slug, my previous hypothesis has been successfully verified. I need to accelerate my cultivation of immortal techniques!"

-

In the dark, enormous cave, Madara Uchiha, who had been sleeping, was suddenly awakened by White Zetsu.

The White Zetsu looked at their newly arrived companions and chattered incessantly, while the latter knelt on the ground and reported loudly:

"Lord Madara, the Divine Tree energy lurking within the White Zetsu of Konoha has suddenly disappeared."

Upon hearing the words "Divine Tree," Madara Uchiha immediately became alert. All the White Zetsu in the cave felt immense pressure, and everyone silently awaited their master's instructions.

"Prepare for the relocation first, then conduct the investigation..."