A/N: Hi! Don't let the name of our heroine trick you. Even though the protagonist's name is Okita Mitsuba, she is not Sougo's big sister that we all love. Mitsuba is his little sister. I just used her name, 'Mitsuba'. This is still an OCxKamui story. Though she looks exactly like female Sougo -sorry, Souko- in Dekobokko Arc where gender bender stuff happened. Story contains bad language and violence. You have been warn. Also I am not a native speaker and I'm just trying to improve my English with my own resources. Writing stories is a good way to learn. So please, when you see my mistakes, please correct me. That helps me more than you can imagine!

Disclaimer: I do not own Gintama or its characters. Gintama and all its characters belongs to Sorachi Hideaki sensei.

Princess of Sadists from the Sadist Planet, Okita Mitsuba

It was a normal day where normal people mind their normal businesses. They entered normal shops and left the normal shops, they ate normal ice-creams and they smiled when they bumped into each other, talked about normal stuff like normal people would do in normal conditions.

Some of the people of Edo were normal after all. That was only expected of them to act normally.

Unfortunately 'normal' was not the word for defining all the folks of Edo since the city was actually hosting the weirdest people alive. For instance, an alien female who eats like an elephant. A silver headed perm who spends all his money on pachinko and strawberry milk. A sad excuse of a teen who is in love with a pop idol and still virgin. An old lady who sounds like Orochimaru. A robot that can feel. A cat looking amanto who curses like a pirate. A stalker gorilla who is mistaken for a human being. A cool guy who's alright except for his mayonnaise obsession. A sadist from the sadist planet who likes to watch the mayonnaise lover cool guy's butt in fire.

Yes, Edo was a colorful city with its normal people and… not so normal people.

Even though some of the people were the definition of weird in Edo, they all had their understandable daily routines that can be considered as 'normal'. For example, the mayonnaise guy and the sadist were patrolling the city every day. The gorilla was stalking Otae-chan (another not so normal person of Edo who makes the best dark matter in all the universe). The old Orochimaru lady, cursing amanto and sentimental robot were working in Orochimaru lady's snack bar. And the others were working (most likely sleeping) in their base called Yorozuya, which was the cause of all the trouble that the city had to face so far.

Yorozuya had 3 members plus 1. The three of them were Sakata Gintoki, parfait loving adult who still is a child in heart; Shimura Shinpachi, just a literal glasses and Kagura the Yato, an illegal immigrant from a far far away planet. They were the Yorozuya, a freelancer group who saves Edo from destruction (sometimes causing the destruction) and trying to make a living from the remains of their hard earned money that Gin-san always spends on pachinko.

But they also had a +1 member who occasionally works with them. Not really an official member of Yorozuya, yet still a part of the lazy trio's useless freelance team.

Her name was Okita Mitsuba.

Okita Mitsuba was one of the people you would think of 'nice and lovely', but actually the definition of 'not nice and definitely not lovely'. She was the little sister of the sadist Okita Sougo who was also enjoying the label 'sadist' on her as well. She was rude, impassive and full of hatred towards to a certain guy who is obsessed with mayonnaise. She always wore a tired expression on her face and carried a wooden sword like the one Gintoki has.

She was a walking disaster with a pretty face. Even though she always seemed like done with life, she was the opposite of being done with anything. Her password was 'more'. More training. More pain if someone is in pain. More blood if she 'accidentally' hurts someone. More scream if she 'not so accidentally' rips someone's arm off.

She was not allowed to kill anyone though. So her other password was 'no more'. She hated that password.

She had the same sword training as her brother. They were both the students of Kondo's dojo and they have sharpened their swords under the care of the gorilla (who was a good gorilla back then but after meeting Otae he just lost it). They were both ambitious. They were both skilled. They were both sadist. And they were both hating on Hijikata, the mayonnaise sucking loser.

They hated on him, because he was charismatic, talented and strong. He was the star of the dojo even though Okita siblings tried harder than him. He was the one who had all the attention and all the appreciation which Okita siblings considered that it belongs to them. And when they moved to Edo, he was the one who stood next to Kondo, to have the title 'vice commander of the Shinsengumi', which again, they considered as theirs. Sougo and Mitsuba started to plan his death scenarios right after they moved to Edo. Also he was serious and mature, so neither Mitsuba nor Sougo could get along with him since they were just kids in those days.

In addition, Hijikata was Mitsuba's first love but she was rejected so badly that she still might have had a grudge against him.

She wasn't sure why she liked him though. He was a cancer producing machine who is actually an otaku deep down. He seemed cool and strong when arcs happened, however even the mangaka was just using him to fight with Gintoki over the stupidest conversations like 'Hijikata Special is better than Uji Gintoki Don' or 'who are you calling Oogushi-kun'.

Hijikata never liked Okita siblings as well. True, he might like Mitsuba in the future if she happens to become a decent lovely lady like she's supposed to be, but he wasn't sure. Even if she becomes a lady like Hijikata might love (though she needed to know how to prepare Hijikata Special if she wanted to get Hijikata like her), Sougo would just use her to get Hijikata killed. Normally, Mitsuba was not all that bad. She was in love with Hijikata for years but her brother was an infamous sadist who would never leave him alone if they end up together. Sougo would definitely use this opportunity to kill Hijikata (Mitsuba might love the idea even though she likes him, because she was a sadist, too). His life might not be a really meaningful one, however he never wanted to give the satisfaction of killing the Demon Vice Commander of Shinsengumi to that sadist duo.

Okita Mitsuba had only one wish in her life:

To be accepted among the Shinsengumi. Becoming a cop. Using a real sword. Killing bad guys.

But Okita Sougo just had one wish as well:

To never let her into Shinsengumi. Not giving her a permission to become a cop. Forbidding her to use a real sword. Preventing her to kill anyone.

As being a sadist like himself, Sougo knew what being a police meant. He was supposed to chase down bad guys and if they're too insistent, take their pathetic lives with his sword. He knew that it meant risking his life for protecting the normal and not so normal folks of Edo. He knew that it meant taking way too many lives with one single sword.

…It meant to become an empty shell.

Mitsuba was a cheerful girl (no matter how much she looked like dead inside). Sougo loved his little sister as she was and he never wanted her to carry a burden of killing someone.

…Though she was a sadist herself and she probably will just like it anyway. Yet Sougo didn't want her to kill anyone. Sougo knew that once she kills someone, there was no turning back and she could never be as innocent and normal as she used to be. He never wanted to damage the pure soul of his little, precious sister.

On the other hand, Mitsuba wasn't sure if she even has a soul in the first place. She never wanted the quiet and sweet life that her brother had planned for her. She only wanted to become a cop to get to use her beloved sword. She was a samurai and samurais need their swords to make a meaningful life.
So, to be able to create her meaningful life, she never gave up on being a police. Even though sometimes her efforts went way too extreme…

(* - -)

It was a hot summer day. There was no one in the streets of Edo, because the afternoon sun was literally frying the streets. People must be crazy to go out and wonder around in this hell resembling weather.

Though no one was that crazy in Edo to walk under the sun when the sun decides to burn them up.

…I mean, besides one crazy person, no one was that crazy to walk in the hell.

That one person was none other than our pretty protagonist Okita Mitsuba. She was wondering in the streets with an umbrella in her hand, but not just walking in any street, walking in the streets that are circling the Shinsengumi Headquarter. She took at least 5 or 6 strolls as whistling just to make sure no one was in the garden.

Nobody's around. Good.

She climbed on the wall of the Shinsengumi HQ and took a deep breath. That was the easiest part. It always was. Sneaking in without alerting anyone was also easy. The hardest part was to avoid Okita Sougo, her own big brother who happens to shoot her with his bazooka if he sees her around the Shinsengumi. Mitsuba's life was not an easy one (considering how many times she had been shot by that bazooka) but she wasn't a type of person who gives up easily. Hell, she was trying to be accepted among that tax robbers for years now! However the tax robbers were also insistent like her. No matter what she did, no matter how hard she tried, they all just were laughing at her efforts and not taking her seriously (sometimes giving her the paperwork though, so she would stop bitching about everything and stop setting traps arounds the HQ). They were treating her as a friend (mind you, she is Okita Sougo's sister, no one can see her anything but friend), yet they never let her join missions. So she had to sneak in and eavesdrop their meetings to get involved somehow with the missions, so that she could prove herself to the tax robbers that she's capable of anything that they throw at her.

Nevertheless they prefer sending her home when they see her in the middle of the missions. They even assigned Yamazaki to accompany her until she reach her home safely (not that they want to make sure she won't come back to the crime scene).

Nothing can break her determination though.
So again, she pulled herself over the wall and rolled to the garden.

Bad move, she thought. I did make a sound. Hope Sougo is busy with patrolling.

To her unfortunate, Sougo was not busy with patrolling. He was in the middle of a meeting and when his sensitive ears heard a thud, he turned to the window and saw his little sister trying to sneak in again.

"Give it a break," he sighed as standing up.

"What's wrong, Sougo? Where are you going?" asked the Gorilla.

"I need fresh air," he said deadpanned. If the meeting was an important one, he could warn them about Mitsuba's presence, however Kondo was just asking them to keep an eye on Otae-chan, because he was believing that someone suspicious was following her. Sougo preferred dealing (torturing) his little sister than keeping 'the only suspicious person who follows her is you, Kondo-san' thoughts to himself. "I'll learn the details from Hijibaka-san later."

"MY NAME IS HIJIKATA, YOU ROTTEN BRAT!" Hijikata yelled, Sougo didn't even bother to listen him.

On the other hand Mitsuba was already in the entrance of headquarter. Normally there would be people who are keeping watch and not letting Mitsuba go any further, however today there was no one. She was a bit confused.

She shouldn't be confused though, because if Sougo was aware of her presence, he would send people away, so that he wouldn't have to hurt anyone else but Mitsuba. Once she realized that she'd been caught, she should have run away, however she knew it's already too late. A bazooka capsule crashed to the ground where she was waiting and Mitsuba literally flew to the ceiling.

When the smoke dispatched, Sougo popped his gum and looked around to see his sister with his bazooka on his shoulder. There was no one in the sight, so he guessed that she was going to attack on him from up above.

"ARE YOU TRYING TO KILL ME, DAMN IT?!"

Okita Sougo jumped back when a wooden sword crashed a hole through the ground where he was standing seconds ago. He sucked his teeth and sent Mitsuba an unamused glance.

"How rude. I didn't teach you like that."

"Shut up, you sadist!" she yelled while attacking her big brother with all her might. Sougo dodged her easily with his own sword and kicked her back once she passed him by. Mitsuba stroke her sword into the ground and with its help, she was saved from smashing through the wall. She smirked as straightening up and readied her sword once again.

"So persistent. You never learn, do you, little sister?" said Sougo with a tired expression on his face. "I already told you, you cannot join Shinsengumi."

"I don't remember asking your permission," said Mitsuba as running towards Sougo. "Since you will be the one who's begging me to join when I beat you up!"

Sougo sighed as dodging her attack again, however this time she turned around on her heels elegantly once she passed him by and kicked Sougo's abdomen. Sougo was surprised, so he retreated.

"You can never beat me, little sister. I am the big brother. Plus I am the Sadist Prince from the Sadist Planet," Sougo started to grin. "It's 100 years early for you to beat me up!" After saying that, he jumped and swung his sword crashed with Mitsuba's wooden one and made her retreat a little bit. Her smirk widened as she made a perfect backflip and kicked Sougo's hand which was holding the sword. Sougo was panicked. His reflexes were telling him to flip his sword, so he can stab her foot (or worse, cut her leg off completely), but he knew that he can't do it. So he decided to act like he just dropped the sword.

"That's dangerous, idiot!" However she only grinned as hitting his chest with her wooden sword and knocked him down.

"You can't stab me, hit me or hurt me. Like you said, you are the big brother. You have to look after me after all. But on the other hand, as being the Princess of Sadist Planet, I can hurt you as much as I please."

Sougo sighed and looked at his sister who was directing his own sword to him alongside with her wooden one. He knew he can just kick her and flip the situation, however he chose staying on the ground and make her happy. Nevertheless she wasn't seem happy. She threw all the swords and crouched down, poked Sougo's cheek.

"You really should stop going easy on me."

"I'm not going easy on you. You just happen to beat me up real good," said Sougo with a smile on his face. How could he hurt his little sister while he was the one who swore to protect her until his last breath?

"You could have stopped my attack but you chose to drop your sword. Do you think I'm blind? That's why I hate training with you. You always let me win and I can't even see if I made any progress or not!"

Sougo straightened up and sat.

"You did make a progress. You used to stick with the sword all the time. Now you surprise me by kicking me. Though I'm still better than you."

"That's not convenient right after you were knocked down by me!"

Sougo smiled, then patted her head.

"Yes, yes. You are the best."

"Don't evade, damn it!"

Sougo stood up and dusked himself. He still needed to patrol the city after this and Mitsuba was still sending curious glances to the meeting door. So he pointed the meeting room before she asked the certain question.

"Kondo-san asks us to watch over his lover, if you must know about the meeting. Don't bother eavesdropping."

"Again? How pathetic that gorilla can get? I feel bad for him, really."

Sougo shuddered and grabbed his sword from the floor.

"Beats me. It's a bad image for Shinsengumi, too. But well, you can't change gorillas. Gorillas always stay as gorilla in heart no matter how hard they try to make a living among the humans." He turned to Mitsuba. "I'm going to go to patrol the city. If you'll just idle around here and waste your time, fine by me. But I'll be back by midnight and I want to eat tamagoyaki. So prepare it before I come home."

"I'm not your slave!" she yelled.

"No, but you're my little sister and little sisters have to look after their big brothers, because the big brothers need love and attention."

She sighed as getting her wooden sword.

"I promised Gin-chan that I'll wash their dishes today."

Sougo felt like a vein popped on his forehead.

"You don't complain to wash that useless perm's dishes but you complain to cook for your own brother!"

She grinned.

"You know how. If you get paid for something, then it becomes endurable."

"So do I have to pay for you to cook?"

Sougo was a bit disappointed. He always thought that they have a stronger bond than this one. Mitsuba smiled when she saw the look on his face. It was fun to tease him.

"No, brother. Because just like big brothers take care of their little sisters now and then, little sisters also need to take care of their idiot big brothers. I cooked and will cook for you no matter what. I'll stick around with you and support you. Because as being the little one, it is my job, isn't it?"

Sougo returned her smile with an equal bright smile and patted her head again. He was glad that Mitsuba was such a good sister.

"See you tonight."

(* - -)

Mitsuba sighed as returning home with her umbrella on her shoulder and her wooden sword was on her belt.

I ended up smiling and walking away again. Nothing changed.

She looked at the cloudy sky. The hot summer day was drastically changing into a stormy one. Now the sun was hiding behind the clouds as if it was not it who were trying to fry people a few hours ago.

"It's been 4 years, damn it!" she grumbled. "For 4 years we've lived in Edo and I still fall for the same smile when he pushes me aside!"

Shinsenumi was a new organization considering the most. It was a special police force under the control of the shogunate that was founded just 4 years ago. 4 years ago, Kondo asked his friends to come with him to Edo to serve the government and use their sword for the Bakufu. Mitsuba was still remembering how excited she got when Kondo first told them that they will go to the capital. Little Mitsuba was just 12 years old. She was already under Kondo's care for 6 years since her parents passed away.

Sougo's case was different. Even while his mother was still alive, he was already in Kondo's dojo, training to be a sword master like his father since he was 5 years old. He was an ambitious little kid who cared nothing to get strong. He wasn't really remembering his father, but he knew that he wanted to be like him one day. His father was an old Jouishishi member who got killed in the war. Their sick mother had to take care of them ever since Mitsuba had born, however she was weak and Sougo knew that she wasn't going to live long enough to raise them.

When he was a kid, Sougo wasn't the type of brother who cares for his sister. He wanted his mother to be fine, so that she could raise Mitsuba. However one day, his mother called him and asked him to keep an eye on Mitsuba no matter what happens. Although, to Sougo, that was an utter nonsense and he literally didn't care at all for his sister, he promised to his mother anyway. He might not be happy to be giving a promise like that, however he wasn't a guy who breaks his promises easily, so he did as he promised and always kept an eye on Mitsuba. Their mother died when Mitsuba turned 6.

Kondo pitied them and took both in the dojo. He took care of them both and tried them to be good sword masters like they wished.

As watching Mitsuba grown up, Sougo finally understood that having a little sister was not that troublesome. He started to enjoy spending time with her as she grew up. She was a cheerful little child. For instance, she also enjoyed watching people suffering, so Sougo felt closer to her. His promise became more important to him, because Mitsuba became more important to him. She was not the same crybaby little girl, she was a sadist in heart who shares Sougo's all good/bad/sadistic habits. Though he should have known that Mitsuba was growing up while watching and trying to be like him. It was only natural she ended up like him. A sadist brat who is selfish and ambitious inside. Yet Sougo's promise was preventing him to see she can take care of herself and make important decisions.

Though that was the reason why he was never going to let his little sister to join the Shinsengumi. Of course he knew she was capable of anything. He just didn't want her to risk her life for it. He didn't want her to face vital decision where she will have to choose between her own life and her comrades.

That was his way to protect her. He wanted to prevent her to become a cop, so that she could continue her life as a normal human being. He didn't really care if she wanted to live as a normal human being. He was the one who turned her into a sadist and now he was expecting her to become a decent human like she was supposed to be. But what could he do? He was just a guy who wishes to protect his sister from all the harm.

Although he was protecting her with his own way, actually his promise was the one that makes Mitsuba suffer for not living the life she wanted. True, she enjoyed working with Yorozuya. True, she loved spending time in Shinsengumi headquarter and bug people. However she never got to use her beloved sword. Even as working with Yorozuya, she wasn't allowed to use her sword. Just a wooden one that can barely hurt anybody (I know what you're thinking when I say barely hurt. Yes, I am very much aware of Gintoki's accomplishments with that single wooden sword but hey, that's just a story! Let's move on!).

"One day, he'll need my help," she murmured. She knew he was going to let her one way or another. Ugh. Maybe one day. She was 16 now, but she was not going to stay 16 forever.

One day, she thought. If I can gather my courage, I can challenge him with all I have. I can kick his butt and he will have to let me become a police!

She knew that he was never going to let her into Shinsengumi though. Her hopes were futile. She knew that if she wants to use a real sword, she had to become an antagonist. She knew that the real courage she needed to gather was for leaving Sougo behind and being a criminal who's ready to spill blood.

But I'm not that brave, she thought. She was still a little girl who needs her brother's embrace when she was scared. She was still a little girl who wants to point at some rude guys and her brother will beat the shit out of them.

I need Sougo more than I need using a real sword, she thought. Maybe when I'm older I can choose that path to walk on… But not now.