Lightning cracked through the sky above Kirigakure, illuminating the village and the mass destruction inside of it. Half of the city laid in rubble, crushed beneath the fight that had happened here only moments ago, but was now at it's conclusion. The people had been evacuated long ago in preparation for this moment.
"Ma...ki...ta.." Seigi would weakly say, stumbling to his feet. Blood dripped from his mouth as he stood, his lungs filling with it. The blade hadn't been placed there by her, but it might as well have been. She had sold him out. Betrayed him. Kept him here long enough for Tatsuya to track him down, the romance of the three kingdoms finally coming to a bitter end. Makita has been the woman Seigi had loved, and even with his own blade plunged into him, his heart felt warm when he looked at her. The Mizukage took a step back, only silence between them. Tatsuya would step forward, a very calmed expression masking his face. Seigi would slowly pull the blade from his side, slinging it sideways to clean the blood from it. The wound refused to close this time, Seigi's chakra all used up. That wouldn't stop him. Nothing could stop him. Nothing had ever stopped him. He had blazed a path forward his entire life, never facing a challenge he couldn't handle. He was The Ichinin, The 7th Son, The Dream Eater.
"Put down your blade and accept defeat." Tatsuya would command him, holding up his hand in a sort of claw. Crystals exploded from the metal wall all around Seigi, closing him off from escape. Tatsuya would draw his own blade from it's sheath. Seigi wouldn't budge, using his wrist to wipe the blood from his eyes, the slunching forward into an offensive position.
"I see..." Tatsuya would mutter, unmoving, unyielding.
"Like a cancer..." Tatsuya and Seigi would move forward to meet each other. The entire battle was over in less than a second, too fast for the human eye to catch. Both men seemed to switch positions instantly. Both of their blades were red with blood. Turning to face Seigi, Tatsuya would stand, turning his body to face him. A large gash ran across Tatsuya's face and down his torso, breaking his armor, a slash so fierce but so precise, it was hard to imagine someone doing it intentionally, but Seigi did not slash to kill. The moment Tatsuya drew his blade, he had accepted defeat. There was no backdoor out of this one. There was no escaping it. It was hopeless to run, but what Seigi could do, was give Tatsuya something to remember him by. Any time Tatsuya would look in the mirror, Seigi would be there always.
Seigi would kneel as blood sprayed from his shoulder, disarming him. Tatsuya would approach Seigi, shifting his right leg back, placing both hands on the grip of his katana.
"....I will cut you out." Tatsuya would finish, piercing the blade through Seigi's chest one final time, until the guard of the handle was to Seigi's chest. Seigi was motionless in his kneel, his head lowered. His hands reached up slowly to Tatsuya's pushing the blade closer through his chest. Tatsuya was taken off guard, Seigi feeling his hands attempt to let go off the blade in surprise. Seigi would use what little bit of his life force he had left to pick himself up from his kneel one last time, speaking into Tatuya's ear.
"Not even hell will stop me."
Turning both of them ever so slightly, Seigi would begin to fall backwards, off of Tatsuya's blade. He saw Makita's face one last time as he went over the edge of Kirigakure's walls, into the waters below.
"This is it." Seigi would think, suddenly feeling relaxed. His chakra had been depleted long ago, and he had no energy left to move. All he could do was let the current carry him. It felt like an eternity had passed before his body hit the ocean floor, coming to rest in the sand. He wasn't that far from the surface, but too far for him to make it now. He knew this and accepted it. Seigi closed his eyes.
He was inside his head, where Chomei once lived. The large Sakura tree that had blossomed here now laid on it's side, burning. Chomei was no longer here, torn from his chest during the fight. That alone should have killed him, so he guessed he should consider himself lucky he lasted as long as he did. Seigi stepped through the ash before finally sitting cross-legged at the ruins of the shrine that once laid there.
"We had a good run. I'm sorry I didn't make it. I'm sorry I didn't get to say goodbye." Seigi would whisper. He lowered his head in shame, letting the darkness take him. He could feel the void open up behind him, consuming him. He couldn't feel his legs anymore, nor his chest. At least nothing hurt.
"Seigi, pick up your head!"
Looking up, Seigi's body had mostly been consumed, turned black, simply gone, sinking into the ground beneath him like tar. Suddenly, the urge to fight on raged again. He would try to throw his arms forward, his right arm catching in the tar, dragging it with him.
"No!" Seigi would scream outward, lurching again. He was sinking faster now, the tar consuming his jaw, his left eye, his head. His arm remained in the air as he reached for something, anything to hold on to. It was harder to see now, as the tar was beginning to cover his other eye.
"I will not... die here...!"
Ripping the tar from his face, Seigi would yell out into the world around him, clawing at the ground, beginning to pull himself from it. Struggling forward, it picked up faster now, retaking his face. Pulled under, Seigi's arm began to sink too, up to his wrist, grasping one more before slowly, calmly, ever so slightly ceasing it's movement as the final bits of Seigi's light began to fade... but as fate would have it, this was not his place to die. A single moth would emerge from behind the ruins of the shrine, flittering around, away from the fire. It glowed an slight green as it flew, casting away it's natural call and flying, strangely, to the single hand that raised from the ground, the last remnant of Chomei's chakra finding Seigi in his darkest moment.
At the bottom of the ocean floor, Seigi's eyes would open. His Fuuingan would shift into it's Samsara state, the seal on it spinning rapidly, until it would begin to oscillate, and then finally, crack in too. Seigi's right eye would shine brilliantly, exploding with energy as everything around Seigi was sealed into it, including Seigi's himself.