After Naraku activated the Red Yang Barrier and realized that Obito had not left, but had instead gone to subdue the Four-Tails, a bold plan arose in Naraku's mind.
He first poured chakra into the kunai Kakashi had given him, which bore the Flying Thunder God formula, and summoned Kakashi from the distant border of Kirigakure.
He then had Kakashi return to Konoha and tell Tsunade about his plan, asking him to bring the Second Hokage over as well.
Originally, his plan had been for the Second Hokage to bring Tsunade and Kushina with him. However, to his surprise, Kushina did not come—Konan did instead.
Naraku was merely somewhat surprised by this. Konan's submission had actually been within his expectations.
Though Konan held a high position within Akatsuki, Naraku believed that she was highly dependent on others. She had once depended on Yahiko, and after Yahiko's death, that dependence had shifted to Nagato.
Of course, both Yahiko and Nagato had been companions worthy of dependence and trust.
Perhaps that was why, in the original story, Konan had not chosen to live on alone after Nagato's death.
Jiraiya, Tsunade, Konan, and the Second Hokage in his Impure World Reincarnation body—those four Kage-level experts could use the Four Red Yang Formation together.
On the battlefield, crimson energy swiftly spread toward Naraku and the others.
When Naraku looked up, he saw the glass-like crimson barrier overhead, and a smile immediately appeared on his face.
His plan had succeeded.
Naraku turned to look at the figure fighting Kakashi, a sharp glint flashing across his face as intense killing intent rose within him.
The reason he had asked Kakashi to bring the Second Hokage, Tsunade, and the others was to eliminate Obito once and for all.
The current Obito possessed two space-time ninjutsu. Under normal