At the same time, the voice of the system kept echoing in his mind.
"System upgrade successful. Three lottery draws granted to the host. In addition, new methods of gaining experience have been added."
"As long as the host is attacked by an enemy ninja and takes a certain amount of damage, experience points will be earned."
Kairen froze. As long as the opponent hurt him, he could gain experience?
Doesn't that mean—the more pain I feel, the stronger I become? It's completely the reverse of Pain from the Akatsuki!
Still, this upgrade is amazing!
As Kairen's regeneration grew stronger, simple attacks could no longer kill him. He used to stupidly wait for his opponent's ultimate technique.
But now, he didn't need to. As long as the enemy dealt him damage, he'd gain experience.
That meant, from now on, Kairen could just charge straight in without worrying about defense. The stronger his regeneration, the more thrilling the battle would be, the more alive he'd feel.
Right—there were also the three lottery draws from the system's gift.
If the system had upgraded even one second later, he might've been dead meat already. Three draws wasn't too much to ask, was it?!
Kairen entered the system space and opened the roulette.
"System, draw! Draw! Draw!"
"Ding!"
"Lottery starting!"
Kairen watched as the pointer spun rapidly, then gradually slowed until it stopped on one item.
[Senju Tobirama's Armor!]
Kairen shook his head. The Second Hokage's blue armor did look cool, but it wasn't very useful.
He stored Senju Tobirama's armor into the system space and drew again.
The roulette spun under Kairen's excited gaze, passed by the Rinnegan, passed by the Tenseigan, and slowly stopped on a Kekkei Genkai.
[Uzumaki Clan Sage Body!]
Kairen froze. What did that mean?
He already had the Senju Clan Sage Body—so wouldn't this overlap?
No, it didn't overlap. Although the two clans were closely related, their specialties differed. Their vast chakra and strong vitality were shared traits—but the Senju Clan had stronger affinity for techniques, while the Uzumaki Clan had stronger affinity for sealing arts. In fact, when it came to regeneration, the Uzumaki even surpassed the Senju.
Moreover, the Uzumaki Clan could awaken many special abilities—like Kushina's Adamantine Sealing Chains, Karin's healing power, and even the Mind's Eye of the Kagura and malicious intent sensing.
Most importantly, they possessed chakra that could suppress Tailed Beasts, making them ideal Jinchūriki.
Kairen even felt that the Uzumaki Clan was the truer lineage!
Even Uchiha Madara had entrusted his Rinnegan to Nagato for safekeeping—clearly looking down on the Senju Clan.
The reward he drew turned into a surge of green energy that merged into Kairen's body.
In an instant, it was as if he were being bathed in holy water—his organs and meridians expanded again, his cells multiplied, and his chakra became denser and more immense.
Having gained the Uzumaki Sage Body, Kairen's chakra increased by roughly that of five Jōnin.
Then, the system voice rang once more.
"Host possesses the Senju Clan Sage Body and the Uzumaki Clan Sage Body. Would you like to merge them into—Asura Sage Body?"
Kairen's eyes froze.
The Asura Sage Body! The very same as Ōtsutsuki Asura's!!
A body even purer and more refined than Hashirama Senju's Wood Release Sage Body—after all, Asura was his ancestor, the son of the Sage of Six Paths himself.
Kairen nodded hard. "Merge! Merge!"
Under the system's power, the two Sage Bodies began to fuse.
The DNA in his cells tore apart, then regenerated. A surge of life force flowed through him, and his chakra grew even stronger—doubling on the spot.
At full output, he could now create over 3,000 shadow clones—enough to form an entire battalion.
That was the amplification of the Asura Sage Body.
Kairen could even feel a forest's vitality gathering inside him—an immense life energy, like countless tiny newborns.
Wood Release had only been a whim to him before, but now, if he went home and picked up a Wood Release scroll, he could create a forest on the spot.
...
Sure enough, just as he thought of Wood Release, the system confirmed it.
"Detected successful awakening of Asura Sage Body. Additional awakening of Wood Release bloodline achieved!"
"I've hit the jackpot! Totally hit the jackpot!"
Kairen's heart soared with excitement. With Wood Release awakened, he was now a certified tree-planter. No matter which forest he burned down, he'd never get jailed again.
Even the Forestry Bureau would have to show some respect to 'Wood-user Kairen'!
"System, last draw!"
The roulette spun once more and stopped on a forbidden technique.
[Forbidden Jutsu: Creation Rebirth!]
That was the jutsu Tsunade developed later in life while traveling across the ninja world—used in combination with Yin Seal and Strength of a Hundred. It allowed cells to endlessly divide, regenerating instantly.
As long as there was enough chakra, even a shattered heart or a body split in half could regenerate completely.
This wasn't mere healing—it was rebirth, transcending the realm of ninjutsu, touching the level of sage arts.
In the past, Kairen wouldn't have cared. He could revive completely just by dying once.
But now that the system rewarded experience for taking damage, battles would flow even better than before.
This technique was tailor-made for his reckless fighting style.
To keep taking hits, keep regenerating, and keep charging ahead—until he reached the Six Paths level through sheer stubbornness.
The entire principle of Creation Rebirth flowed into Kairen's mind, and he instantly mastered the forbidden jutsu. From that moment on, he was the immortal Kairen.
"This time, I really struck gold!"
One lottery draw, two major prizes—and on top of that, he awakened the Asura Sage Body and Wood Release.
Who else could compare? Who else?!
He nearly died for it, but Kairen felt this was the system's gift to him.
After all, a father who neglects his son for a day… should at least send an apology gift, right?!
His consciousness returned. Though he had been busy for what felt like 2,000 words in the system space, in the real world, only two seconds had passed.
Kairen suddenly dove down from the sky, the immense impact creating a powerful gale. The ninja below all flickered away instantly using Body Flicker.
His Byakugan locked on the direction where Danzō had flickered to. Seeing him appear a hundred meters away, Kairen flapped his wings and shot forward, breaking through the air.
Danzō looked up at the giant eagle swooping down toward him, forming hand seals.
"Wind Release: Vacuum Great Sphere!"
He took a deep breath, chest swelling, and fired a white air cannon. It tore through the air and struck Kairen's eagle head.
"Ding!"
"Shimura Danzō dealt 30 damage to you!"
Kairen only felt a slight itch on the eagle's head. The Vacuum Sphere disrupted his chakra flow for an instant, but it quickly recovered as he continued his dive.
Seeing his attack fail, Danzō inhaled again.
"Wind Release: Continuous Vacuum Spheres!"
He fired five Vacuum Great Spheres in succession, all exploding on Kairen's body.
"Ding!"
"Shimura Danzō dealt 100 damage to you!"