Chapter 2
It took 3 months to get to the mountains graveyard. By then the 2 Kagami have merged half way.
"Who are you?"
"Long time no see Madara-shinsou."
"Kagami." The elder one breathed in disbelief.
"It's high time you die. The infinite tsukiyomi is a lie. So caw caw motherfucker."
He cleanly beheaded an aged Uchiha Madara. Sometime during the next week between Older Kagami slamming giant black fists into the Statue and Young Kagami blowing it up sky-high and bringing the ceiling down on them. Black Zetsu abandoned the White Zetsu it was wearing and slipped away, liquid fast, Kagami's finger just barely skimming it. But a skim is still a touch and a touch is Kagami needed. A seal, glowing stark white against black sludge-like shadow, curls around it's form. Even as it disappeared from sight, Kagami could feel it, his seal sunk into Black Zetsu's very essence, heedless of its efforts to get rid of it.
"Feel it?" Young asked while standing back up.
"Yep." He shared the echo of the seal, named GPS, with them. Kagami grinned and gave him a thumbs up.
They turned around and surveyed their ruined surroundings. A large crater had replaced what was previously forest and rock with upturned earth tumbling down randomly. Parts of the Demonic Statue stuck up, scattered. Madara's corpse and several hundred thousand White Zetsus were buried somewhere underneath all this. He clapped his hands together cheerfully. "Let's mosey, ducklings. This is your mess, after all."
~~~~~~~~~~~~~~~~~
Black Zetsu is a slippery, slippery, slippery piece of shit. Kagami saw and experienced it first-hand for the next three weeks as they chased it all over the Elemental Countries. It didn't even have the decency to hide in the wild either. So far, they had caused five market riots, body-flickered through ten houses and one daimyo palace, interrupted sixteen battles, and upended two war front.
~~~~~~~~~~~~~~
Tobirama groaned, he sunk back into his chair after he read the report.
"Is this about the Red Demon?"
He looked up to see his elite team consisting of Hiruzen, Koharu, Homura, Danzo, Torifu and Kagami. The Uchiha had a distant look in his eyes, had it for the last 3 months or so after he suddenly collapsed during training, and his chakra changed, it was more... dark, possessive, untamed.
'Red Demon' was what Intelligence had coined for the mysterious shinobi that had appeared out of the blue one day.
Monstrously powerful and an unparalleled sensor by all evidence, rivalling that of his own. The war had been thrown into chaos by this new player that uncaringly tore his way through everything, be it daimyo palaces, civilian towns, and even hidden villages. They were always covered in red. They also seen with a partner sometimes. It was clear the shinobi was chasing something. There were multiple reports of a black shadow indiscriminately manipulating anything and anyone within their reach to attack and flee while tangling with Red Demon(which, what even was that thing?).
"Yes, they at least got to confirm that they are part Uchiha. Seeing as they can possess the sharingan and have the ability to turn it off."
"Shit, that just complicated everything."
"No shit."