A/N: I'm not sure how long I plan on making this story. It'll probably be a shorter story, but with longer chapters. I will try to finish it.

Enjoy!

At first, everything started out like normal. It was a sunny day in Edo, people were smiling, frowning, wishing for a change in life. They definitely got it.

The sky opened up and the Harusame landed on the Earth, and decided to try and take back what they thought was theirs. However, humanity was a stubborn species, and even if some of it gave up, others would resist.

The Harusame would find that out the hard way.

An explosion consumed a building and debris and ash surrounded the street. Some ships that floated were shooting some large cannonballs at them.

The Amanto decided that some of the people of Edo became to dangerous and that they must be eliminated. What better way to erase them from history than to destroy their homeland as well? Their homeland was the thing they protected, after all.

"Sadaharu!" Kagura exclaimed.

Some debris landed on her fluffy white monster dog. The orange-haired girl ran over to him. Only his head and a paw stuck out. He was alive, but barely.

Gintoki Sakata, one a feared samurai known as the Shiroyasha (white demon) was the one who was afraid. He looked up and saw some parts of the building slide downward, and they would soon crush the Yorozuya..

"Kagura, we need to leave, now!" Gin shouted, at the top of his voice.

"But, Sadaharu! He'll-"

"Kagura!" Shinpachi yelled. "There's nothing we can do! If you stay, you'll die too!"

The rubble collapsed and started to fall towards them. Kagura's eyes widened and Gin prepared to take the damage, while Shinpachi tried to drag her away; failing.

Sadaharu's eyes snapped open and he transformed into his monster dog form. He pushed the Yorozuya out of the way and the debris crashed into the spot they were seconds before.

"S-Sadaharu!" Kagura exclaimed.

Sadaharu looked at her dog who was even bigger than before. Unlike the first time he transformed, he was in control.

He looked down at her, eyes filled with compassion, an urge to protect, and regret. Regret that he couldn't stay with her forever. That was a look she recognized above all others.

"S-Sadaharu, what are you-"

He leapt into the air and seemed to soar towards his target: the ship that got them into their current situation. Sadaharu's weight collided with the ship, which forced it to tilt sideways. The dog attacked it enough to make it crash into a building, destroying the building instantly.

"Sadaharu!" the three cried.

Kagura prepared to run after him, she knew there was a chance to save him. However, Gin grabbed her wrist, along with Shinpachi's, and pulled them in the opposite direction.

"Gin!" Shinpachi yelled, as he struggled.

"If you go there, you die! I am not going to take that chance!"

"But, Sadaharu is one of us and always has been!" Kagura argued.

A racoon-like Amanto attempted to shoot them from behind, but a kunai struck its neck, which killed it instantly.

Kagura looked and saw Tsukuyo with her army of ninjas beside her. Sacchan was there as well, with her own.

"Charge!" Tsukuyo demanded.

"Tsukki!" Kagura cried.

"Gintoki, in order to prevent humanity from extinction, will you give me your-"

Tsukuyo's kunai pierced the side of Sacchan's head.

"You owe me one, Gintoki," Tsukuyo said, facing him.

Kagura saw him smirk.

"So it seems."

"Sadaharu! He-He went after one of the ships! Please, help him!" Kagura pleaded.

Tsukuyo and Sacchan looked at each other, before nodding.

"It will be done," Tsukuyo responded.

"Yes, Gin's pet will be in good hands," Sacchan agreed.

They parted and the sound of sirens reached their ears. The Shinsengumi must be close.

"We should get out of here," Shinpachi stated.

"Agreed," Kagura said.

"Not so fast," an intruder's voice uttered.

Distant explosions caused Edo to shudder. Before them was none other than the one person Shinpachi knew that always found a way to make Kagura's eyes boil with rage.

"Kamui," she blankly stated.

"I see you are still with that weakling as always. Though, I admit, there's one that catches my interest."

Shinpachi grasped his wooden sword and charged, prepared to strike her evil brother down. But, Kamui stopped it with the palm of his hand, shattering the blade. Some wood-chips pierced his flesh, but he didn't seem to be affected at all. Kamui truly was a monster.

"My business here is not for you, glasses," Kamui remarked, before punching Shinpachi in the side of the head, sending him flying into the bottom of a building.

Kagura almost kicked him in the head, but he ducked. She landed behind him and he easily avoided all her punches.

"As long as you avoid your blood, you stand no chance against me," he said, with a fake smile planted on his face, like always.

Meanwhile, inside one of the ships, a man with golden butterflies on his common savored his cigarette smoke while he stood on the deck of the ship and admired the destruction of Edo.

"To think it would be so easy. I thought they would last longer," he stated.

"Should we go down, Shinsuke?" Bansai asked.

"Go ahead. I'll wait a bit longer. I want to be able to smell the blood of those that weren't strong enough to stand before me."

Bansai nodded. He planned to have a little fun with the Shinsengumi, since his previous encounters with them were always cut short.

"Edo's time is up," one of the infamous elders said, to no one in particular.

"Shall we give up on this planet?" another questioned.

"No, we will simply rebuild. There is much of this planet that we haven't conquered, Edo was just a test subject. We can remake the city and make it our Earth headquarters. I was thinking of calling it 'Tokyo'. A city where there are no samurai, ninja, or any other pests to interrupt our business."

"I like it," one agreed.

"Yes, this is perfect," another said.

"But, what of the survivors? Not all are weak enough to die from such a catastrophe," another noted.

"They will work for us, in Tokyo, part of the Harusame, or something else," the main one decided. Besides, some of the strong ones need to live, because we need them to make more strong ones. It's time for the weak to die out. The age of Amanto has finally arrived on planet Earth."

Everyone in the room seemed to be satisfied.

Kamui caught Kagura's fist before it could impact his face. He crushed it, which caused blood to squirt out, then kicked her in the stomach, sending her back. She managed to land on her feet, but her knees sagged.

"Why, Kamui?! Why must you go this way?!"

"What reason would I have to defend this piece of rock?" he asked. "None. This planet could turn into gravel for all I care. Though, the food would be missed. Now, why don't you go to sleep?"

She ran towards him, but he jumped and head-butted her, and her crashing into the ground created a mini crater.

Then, she unwillingly let the darkness take her.

All Gin could do was stare. His friends were all taken out effortlessly. It happened so fast that he couldn't move.

"Sooo, Gin, was it? Care to take me on? Out of everyone I have fought on this planet, you have captured my attention the most, so as a reward, you can fight me while going all-out. You never do that, after all."

Kamui backflipped the second Gin tried to cut him in half. He landed in a crouching position, then backflipped a second time when Gin tried again.

"For the only one that's a thorn in Takasugi's backside, you are weaker than I imagined."

"Don't mention him! This is between you and me!"

Gin took a foot to the groin and tumbled backwards. He somehow managed to get back up to his feet, blocking Kamui's jump attack with Lake Toya.

A little kid almost ran right into the center of the fight, but managed to stop himself. Kamui immediately acknowledged his presence and ran towards him, hands ready to end the kid's life.

"Come and play!" Kamui sang, his real goal clear.

Kamui prepared to shoot the kid with his umbrella and the kid began to retreat, tears falling down his face. His bare legs were bruised, and his body was covered in filth.

He prepared to slice through the kid's back, but a piece of wood wound up piercing his flesh instead. It wasn't Lake Toya, but some rubble that was found scattered somewhere, because Gin knew he wouldn't have been able to make it in time.

"Run!" Gin demanded, before the kid retreated off.

"Only the strong have a place in this world. Only you have a place in this world, Gin. Or, should I say, Shiroyasha?"

Kamui dodged his punch and Gin received a kick to the chest, then a bullet flew out his shoulder. That caused Gin to stagger. Then, Kamui's foot smashed into his head, making Gin's head hit the ground.

"How disappointing. No wonder the Elders decided it was time to end this planet."

Kamui was about to turn around, but Gin opened his eyes and grabbed his ankle and squeezed it hard. Some blood lines formed when Gin's nails pierced Kamui's skin.

"Ready for more?"

"You... can fight me all you want. As long as I'm alive, as long as my allies, my friends are alive, humanity won't die.

Some of Kamui's blood got under Gin's nails. Gin barely noticed.

"Guess I have to kill you, then!"

Gin received punch after punch, kick after kick. He knew he could not win the fight, not alone. However, he had no choice but to hold out. He was currently Kamui's punching bag.

"How does it feel like that, hmm? To see your 'friends' like that? It must hurt, huh? I plan on letting you live so you can see the city you failed after the Harusame's attack ends, so be glad I took pity on you, Shiroyasha, the warrior I once admired. Be glad."

Kamui slammed his foot into Gin's face and Gin's body went limp.

"Now, off to finish the rest of the Yorozuya."

He approached Kagura, and pointed his umbrella at her head. After today, she would be gone. Finally.

"Bye, annoying sister of mine."

Gin's eyes snapped open and Kamui crashed into a building. Kamui noticed Gin's bloody fist.

"Oh? Weren't you unconscious?"

Gin disappeared from sight and sent his foot flying into Kamui's backside. Kamui attempted to get up, but Gin landed on top of him. Then, Gin drew his sword and tried to pierce his neck. However, Kamui got lucky and managed to disarm him, and sent his sword flying.

"So, you're not as weak as I thought. I like that look in your eyes. So, this is what it feels like fighting the Shiroyasha. Though, I think we need more room to fight, so I cannot let this continue any longer. Sorry, Gin."

Kamui punched Gin in the face, which made Gin fall into darkness again.

Kamui knew something was off. He knew he knocked Gin out, yet Gin didn't stay down.

From the very beginning, he knew Gin was different from most humans, not just from his morals, but from his crazy amount of strength. It was a strength that rivaled the strongest species known in the universe; the Yato's.

"Perhaps he isn't as normal as he thinks he is," Kamui said.

More than half of Edo was destroyed. Harusame just started being sent to Yoshiwara. Their main goal was to capture Courtesan's, since they originally belonged to an Amanto. Anyone else would be slaughtered.

Hinowa told Seita to run, but he pushed her out of the building regardless. He avoided an enemy's spear, and bolted down the war-torn streets.

"Set fire to the city!" a voice bellowed.

It was happening all over again, and that time, no one was there to protect him.

"There is no way out," Hinowa uttered.

"No, mom, there must be a way!"

"All the entrances are blocked. I'm afraid that you have no choice but to hide in the sewers below, if you wish to survive the night."

"Mom, you're coming with me!"

"I-"

"No arguing! Now, tell me where an entrance is!"

She nodded and they eventually found one. However, they were spotted by some Amanto.

"Get her!" one ordered, the other two.

"Mom!"

Hinowa pushed him down the sewer hole and pushed the lid over it. They grabbed her.

"I can't walk! You're going to have to push me!" she told them.

"What about the brat?" one questioned.

"What brat?"

"The one that was with you!"

"He ran away."

"Leaving his mommy to be captured by aliens? That's pretty cruel of him. You should've raised him better," the creature taunted.

"I taught him to survive. He seems to have learned pretty well."

"So it seems. The brat is lucky. He won't be killed by me, but he may be taken out by someone else. Come on, let's move!"

Seita hold the whole conversation and was in tears, knowing he would never see her again. He was going to be alone again. But, he would not give up. Seita would protect the city when the flames died. He would do what his mother once did and more. That was how he would repay her, and everyone else that assisted him. It was an oath, one he didn't plan on breaking.

Gin opened his eyes and tried to sit up, but he realized that he could not move his body. He could only shake his head around.

"Ah, you're awake, Gin," Kamui announced.

"Where are we?" Gin asked, realizing he could speak.

"In an abandoned building. Don't worry, I ordered the Harusame to not attack this area."

After a brief moment of silence, Gin said, "so, you're not going to kill me?"

"I just found out what you really are. What fun would killing you be if you don't even know yourself?"

Gin looked at him questionably.

"So, you really don't know, huh? I'm sure you've always known you were different than others. You're stronger than any of them. Why? Because you're like me! Like Kagura! Like Abuto! Like the King of the Night! You're a Yato!"

Gin's face paled. He didn't expect that. Him, an alien? There was no way.

"No, that's not possible. I'm not one of you!" he denied.

"I knocked you out. You should've stayed down after that, but you didn't. You made my day more interesting than I originally planned it to be."

"I got up?" Gin questioned.

"You don't remember, huh? You actually gave me quite the beating afterwards. I was about to kill my annoying sister, but you woke up and ruined my fun. You're a monster of the night. A danger to Edo."

"No."

"Yes. But, you're not one to me. I can teach you how to control your power. When your training is over, I can even take you to Takasugi so you can defeat him. Only the strong deserve that level of power, after all, and all he does is watch everything from above, while we're out doing the dirty work. It's time someone better took charge."

"You?"

"Good guess, but I was thinking, you. I have been planning to overthrow him for awhile now, but I found someone who may outmatch me in power. I deserve a large title, but until I can defeat you, I can't be leader. So, what do you say?"

Pros and cons. Gin could learn how to control his power (that may or may not exist) and make it safer for those around him, or he could be a potential danger to Edo (even though it was already destroyed, there would definitely be survivors, because Edo's citizens were known for being stubborn). The main downside was that he would have to abandon his friends, and there was a huge chance that Kamui wouldn't let him say 'goodbye'.

"If you're lying to me, I'll break your legs," Gin threatened.

"I'm not lying, Mr. Samurai. Or, should I change that to Mr. Yato?"

"Fine, but get the Harusame out of Edo."

"And, if I don't?"

"Yato's have super healing, right? I'll break your body the second mine heals, and do it to you, over and over, until you agree."

"Wow, no wonder Takasugi is attached to you. You guys are alike," Kamui remarked.

"Don't compare me to him."

"Yeah, yeah."

Kamui pulled a walky talky out of his pocket.

"Please send a ship to pick me up. I will give you the coordinates."

A ship arrived a half-hour later, and Gin realized that he had feeling back in his arms. He was able to move them, but they hurt if he overdid it.

"What about him?" An ice wolf Amanto asked.

"He's with me. Lay a hand on him and you're dead."

They didn't even question Kamui's words, since they've seen him kill allies with their own eyes.

Gin took one look back, and followed Kamui onto the ship, abandoning Edo.

A/N I haven't decided if I want Gin to be a full Yato or a hybrid. Feel free to give me your opinions! It'll help me decide quicker!

See you next chapter!