AU. Ichika is a teacher, Madoka is a student, and Chifuyu is ... Chifuyu.

Ichika rubbed his sore neck as he entered the Academy.

After all, being a unique individual doesn't come without its stress.

As soon as his talent was discovered, numerous governments tried to place him under their control. To settle their needless squabbling, he asked for tournament of those countries' best representatives to fight.

Whoever bested him would be granted his submission. And nobody did, despite he being only eight years old.

That was the First Mondo Grosso.

For every year that occurred afterwards for seven years, the tournament was reignited by numerous countries in hopes of finding a way to coerce Ichika to following them. Needless to say, they did not succeed.

Ever since the Second Mondo Grosso tournament, however, his absolute domination of the IS world had piqued the interest of nearly every person there was - including terrorists. They had attempted to capture him, only to fail spectacularly in public eyes.

However, as Ichika was living in a small home by himself and his younger sibling, something that shocked the other nations greatly, this placed stress on his well-being as well as his safety.

Of course, whatever plan was made was simply tossed aside when Ichika replied as before, accepting only those that defeated him.

By the time he was 15, however, he could no longer avoid international demands, as they wished for him to join a world power. When he finally made his decision, he caused many countries to be both overjoyed and dismayed at requesting a job at the IS Academy. Overjoyed, because their representatives would be training under him and dismayed since he was now officially out of their reach.

'I wonder how neesan is, after all these years,' he thought curiously. 'While I'm angry that she left Madoka and I to live by ourselves without warning, she still can't remove her place in my life.'

Shrugging off these thoughts, Ichika adopted his more public facade, stern and cold, to teach.

'I swear, if I get a class of idiots...'

'Why do I get the idiots?'

Ichika mentally slammed his head on the desk as he was faced yet again with people who cared less about the IS and more about him.

"Good grief," he muttered. "My class is filled with idiots yet again."

He then glared at the socializing class.

'As expected, not a single person is capable of doing anything useful in this class. Well, maybe except her.'

His eyes glowed with frustration as he looked at the cheerful students.

'Evidently, they don't remember THAT.'

The Androcide. The legendary killing of men. Brought on by the arrival of the IS suits, and fueled by the rage of gender inequality, governments around the world found themselves under coup d'etats around the world. Initially, there was little bloodshed, as most men capitulated under the threat of their IS wielding sisters invading, but power corrupts. To the shock of many males and, to a lesser extent, females, women began slaughtering their male counterparts, aided by the indomitable power of the IS.

Their reasoning was the simple fear that males, with their naturally more aggressive nature due to excess testosterone, were still a threat to womankind as well as the fear of retaliation. They argued that so long as males existed, women were in danger.

Ichika's grip around his pencil hardened as he thought of Tabane's invention.

'Tabane would never dream of creating world war. She loves us three much to put us in danger. Or ... was it her plan all along?'

Hundreds of millions of men died in the ten month reign of the Androcide. The male population declined from a once proud several billion to approximately 80,000.

Women were so caught up in their bloodlust that the killing did not stop until Ichika's capability to handle an IS was revealed. The sheer shock of seeing a male use what was thought to be a gyno-specific weapon jarred many women back into reality.

Although women formally and tearfully apologized to the males, who were too exhausted to say no, the damage was done. There was approximately one male for every ten thousand females. The human population was essentially doomed.

To make up for this, numerous males were rounded up, with their consent, to become seed banks and become fathers to the next generation. Initially, Ichika was also going to become another seed bank in hopes of breeding better IS pilots as well as the chance of having more male IS pilots to breed. However, that thought was tossed aside when they realized that they would have to subdue him, a task thought to be impossible.

"Um, nii-sama?"

Ichika spared a glance before glaring at the speaker, his little sister, Madoka.

"I will warn you now, Orimura-san, that in school you will address me as Orimura-sensei, understood?"

Madoka gulped slightly before lowering her head in submission. "H-Hai, sensei."

Ichika looked at his sister before his eyes softened at her crestfallen look. "Is anything wrong?"

"No, I just wanted to know what you were thinking, sensei. After all, you did space out for the past few minutes."

Ichika checked the time, and sure enough, he had wasted about two minutes simply contemplating his thoughts.

"Forget it, Orimura-san, although I do apologize for wasting your time."

"I-It's alright! N-Nothing was wasted so long as you're okay!"

Ichika sighed at the sight of his flustering sister before ruffling her hair. "Get to your seat, Orimura-san."

Madoka was, contrary to how she reacted with her brother, a person who rarely let her emotions show.

She remembered the fear that gripped the family as the Androcide raged on.

All because of HER.

Madoka internally growled as she thought of the woman key to suffering and stress that her beloved brother was dealing with right now.

'Chifuyu...'

Had she not ever picked up the IS, none of this could have happened. But she had to, and by demonstrating the military excellence of the IS, had brought on humanity's downfall.

'And worse,' she grumbled. 'Nii-sama still cares about her. Every time I sneak a look at him at night, I always see him caressing a photo of her before going to sleep. Oh, to be caressed by nii-sama...' Madoka soon lost herself to her own fantasies.

"Oi, Madoka!"

Madoka spun around, furious at whoever interrupted her desires before facing Houki.

"Houki-chan!"

"Took you long enough, you damn brocon. Tell me, how has your progress with Ichika gone?"

"Sh-Shut, up! I'll get him, eventually! I just need more time." Madoka showed off a very uncharacteristic blush while blurting those words.

Houki shook her head. "You don't even bother to deny the accusation."

"Of course, how else am I supposed to show my claim over nii-sama if I stay quiet about it?"

Houki facepalmed. "That's not the point here..."

Madoka looked at the second teacher in the room, Ms. Maya Yamada. From first sight, Madoka knew that she disliked her, although whether it was because she was too childish or if her chest was far more endowed and she spent more time with her brother, she didn't know.

Thank Kami-sama that Ichika was probably denser than a black hole. It also gave her a guilty pleasure whenever she heard his response when someone offered him a marriage proposal.

"Too busy looking after my imouto, not interested."

While it wasn't the most romantic thing he could have said, it was still enough to let Madoka internally gloat at the crestfallen looks of Ichika's probable suitors.

"Wait!" someone shouted out. Everyone looked at the speaker.

"Madoka Orimura and Orimura-sensei share the same last name, not to mention that she just called sensei 'nee-sama' ... could they be related?"

Before Ichika could deny anything, Madoka immediately stood up.

"Of course that is true! Even if sensei is still my sensei, he is my older twin and my nii-sama. I won't let any of you take his heart and attention away from me!"

The class gaped at her bold proclamation while Madoka was blushing heavily at her loud claim over her brother.

SMACK!

A loud sound reverberated in the air, showing a scene of a mildly annoyed Ichika with the attendance book hitting Madoka.

"You idiot. I said that while we are in class, you are to address me as Orimura-sensei and nothing more, regardless of our personal relationships or age."

"Muuuuu... sorry, sensei."

Ichika rubbed his forehead before looking at the class.

"This is why I hate working with brats. Then again, not even the seniors are as mature as you lot, believe it or not. Anyways, it's time to nominate your class representative. As usual, students who are nominated cannot request removal."

"I nominate Orimura-sensei!" a random voice called out.

"Rejected."

"What?! But didn't you say those nominated cannot remove themselves?!"

"I said students. Besides, as a teacher, I would only be hindering your IS Academy experience if I were to take every class role."

A cloud of depression descended on some students, who were eager to show off to the others that they had Ichika as their representative.

"What about Madoka-chan?"

"It may not be Orimura-sensei, but at least it is his sister!"

"Yeah! I nominate Madoka-chan as well!"

Madoka looked at them in irritation before realizing what this entailed her. This was the perfect opportunity to show that she was worthy in Ichika's eyes!"

However, before she could agree, a slam erupted from the back of the room.

"This is unacceptable! I Cecilia Alcott, heir of the Alcott name, refuse to let such ridicule befall the grand world of the IS!"

Everyone looked at the English blonde, who smirked at having gathered the attention of the entire class.

"Honestly, what fools can you lot be? What good is a male in an IS suit, a sign of woman superiority? It shows that he should be under OUR control! Not to mention, a teacher at such a young age, the insanity of it! Japan must have gone mad, although it it is to be expected from such a backwards country. And her, really? All I see is a bimbo using her brother's ill-gained influence to get what she desires. Not to mention, a brocon tendency? What is wrong with you? Have you no sense of decency? By my word, all of you are defiling the brilliance of the IS world with such pathetic adoration of a stupid, chauvinistic male. However, I can save all of you from such an embarrassment by becoming your representative. I, the pride of Britannica, the only who defeated an instructor, am clearly the best choice."

"Um, actually," began an annoyed Maya. She evidently did not take insults to her students or her country well. "There was actually another person who defeated an instructor."

"WHAT?! That is impossible, I checked the records!"

"The reason why she is not in the records is because she beat an IS instructor without an IS. All under five minutes. And that lady is none other than Orimura Madoka."

"Heh, as if she would actually do anything so great? What can a petty girl do, if she stays in the shadow of her brother's disgusting existence to gain influence? That instructor probably took it easy on her."

"Oh? So you think that an instructor is easy to beat?"

Everyone froze as bloodlust flooded the room. The source?

None other than Ichika.

"I couldn't care less what grudge you have against men in general or any insults you have towards me. In fact, I welcome them. It's nice seeing someone with guts once in a while. However, in the past two minutes you have insulted my country, my colleagues, my students, and my imouto.

"Do you know how hard life was for the both of us? During the Androcide, our parents were killed by someone corrupted with power. For the past eight years, Orimura-san and I have been living by ourselves, neither old enough to even turn on the boiler for a warm bath nor capable of operating a stove for a cooked meal. But I'm guessing that a spoiled brat like you wouldn't understand the word 'hardships.'

"Do you know what it was like? Comforting my imouto because she missed her parents, that our sister had left us to fend for ourselves, that our companions were the roaches and rats that survived the carnage. Only when I came across an IS did we actually feel the comforts of an actual home again.

"Like I said, I don't give a damn about what you say to me. But badmouth my sister or anyone else in this Academy, and I will punish you severely.

"I propose a duel. If you win, I will resign my job and work under England with you as my absolute master. You will be pronounced as a national hero and will have everything you want at your beck and whim. Also, the representative title will be yours. However, should I win, I demand an apology to everyone in the entire school. I am sick of your limey arrogance, and as I teacher, I find a need to curb it immediately. Should I win, I will allow Orimura-san to take the role of class representative, should she accept. DO you agree?"

"Of course. There is no way that a lady as refined as I am will lose to a barbaric male like you."

Ichika glanced over the room. A few of the more fragile girls had let a few silent tears out at Cecilia's harsh words, while numerous others were glaring at the arrogant British girl.

"So be it. You would do well to remember out match next Monday. Miss Yamada-sensei, please cover me. I need to arrange for the duel."

Madoka looked at her brother in apprehension. Making up her mind, she decided to sneak out of the classroom and meet up with Ichika, who was almost out of sight.

"Sensei..."

"Forget it Orimura-san, this is no longer about her insulting you. I am also defending the Academy's reputation as well as the country's.

"Besides," he said with a twinkle in his eyes. "You think a petty brat can defeat your brother when entire nations couldn't?"

"Nii-sama..."

Ichika ruffled Madoka's hair, causing her to purr slightly.

"Come on kid, get back to class."

Meanwhile, in Okinawa, lied an underground base, whose quiet outer appearance hid the activity that was going on underneath.

"Soon ..." whispered a voice from the shadows. Her tone was that of a female's, yet her face and form was obscured by the darkness of the room.

"Mistress."

"Report."

"We have finished all preparations. Permission to attack the Academy?"

"Denied."

"Ma'am?!"

"It is too early ... there is no fun prey as of yet ... well, besides him, but that is to be expected. Put everything on standby mode."

"Yes, ma'am."

As the second voice left the room, the first speaker chuckled slightly.

"Besides, Ichika would be so annoyed at revealing me to our darling imouto so early ..."

The woman laughed darkly with a crystalline voice sent shivers down most of the people within the base.

"I'll be seeing you soon," she whispered.

"Otouto."

And before any of you rant at how I ripped this off of another story, yes I am aware of the fact that there is another story with the same plot. However, I only used the same theme: role switching, and decided to change almost everything else.

Ugh, time to face the rage of the readers of my other stories...