Try Imagining Lelouch (from Code Geass) as Manami's Onii-chan (Meh. I choosed him because of his purple eyes)

It was a peaceful day. The sky turning from orange to blue and the sun saying good bye and entrusting the moon to give light.

But even if the day was about to end, two student from Kunugigaoka Middle School is still studying in an old building which is the Class 3-E's classroom.

"Now, try solving this one." Said a boy with red hair.

A petite girl nodded as her pencil made contact to a paper full of math problems.

The noise that her pencil made was the only thing to be heard in the room.

Once she was finished solving, she gave her answer sheet to the boy. The latter then checked it if her answers were correct.

He then smiled at her while waving her paper.

"Wow. You're a fast learner Okuda-san! Next up is Literature~" he teasingly said knowing that the twin braided girl hates that subject the most.

Before she can even complain, a yellow octopus interrupted their study session.

"I know that studying is important but, it's getting late, so better get home you two." He calmly said as his round yellow face started to turn light pink.

Karma threw an anti-sensei knife at his teacher as he stuck out his tongue. Manami on the other just giggled at her classmate's childish behaviour as she fixed her things.

Once the two teens were done putting their textbooks, notebook and pencils in their bag they stood up and bid their farewell to Korosensei.

Karma offered to walk Manami home not wanting the girl to caught trouble.

The path to Manami's house was silent, but it wasn't awkward. It was comforting actually.

"Hey Okuda-san. Would you mind if we stop by the convenience store?" Karma asked as he pointed out the place.

The girl nodded shyly as her lips formed a straight line.

Manami just followed wherever Karma is going. She saw the things that he kept putting in the basket, which are wasabi and mustards.

Once he was finished with his little errand the two walked their way to the counter to pay for the things the prankster brought.

After paying, the two started to continue to walk to the path to Manami's house.

"Okuda-san, how about we continue studying at your place?" Out of nowhere Karma asked with both hands on the back of his head still holding to the plastic bag that contained his prank materials.

"W-why my place? And besides it's late." Manami stuttered as she clutched to the other plastic bag she was holding that also contained Karma's prank materials.

The boy looked at the starry sky up above them as he reasoned out.

"That's the point. If we do it at my place I'll worry about your safety. But if it's in your place you don't have to worry at all."

Manami was hesitant for a moment. Imagine, the two of them alone at her house makes her nervous and anxious.

But then, she knew Karma for quite a while now. He hasn't teased her since they've become friends. Maybe he is safe to be with.

"I-i guess i-it's fine. Though, my parents won't be home tonight." She said as she looked up as well.

Karma's gaze fall down to her as he smirked, like he usually does.

"That settles it."

They continued to walk until they reached Manami's house.

But the two noticed that the lights were on. This made Manami panicked.

"I'm sure I turned it off when heading out. And Mom and Dad wont be here till next week."

She was confused, scared and nervous.

Karma reassured the twin braided girl that if it was a burglar he would defend her. So they opened the small gate which made a sound that can be heard in some horror movies where the protagonist opens the door of a haunted mansion.

Manami bravely walked in front of the wooden door. She pressed a button on the side as a sound can be heard from the inside of the house.

A moment later the door opened revealing a tall man with raven hair and lavender eyes.

The man squinted for a second.

"The hell are you? Manami's boyfriend?"

Karma was taken a back as his eyes widen from the sudden question.

"N-n-n-nii-san?!" Manami stammered as her face heat up. But instead of being embarrassed she remembered Karma behind her.

So she shoved her older brother away from the doorway as she gestured Karma to come inside.

"Are you here to get my permission? Sorry, but prove yourself first." He said in a business-like manner as he crossed his legs.

"Maiko-nii! Karma-kun and I are just going to study!"

The bespectacled girl explained for the nth time the moment they went inside.

Her older brother doubted her excuse. He can feel something suspicious from the red headed boy in front of him. Mischief can be seen in his mercury like eyes. He better keep his little sister safe from the likes of a prankster.

"Have you eaten something yet?" Asked the raven haired man.

"No sir." Karma immediately replied as he felt uncomfortable from sitting up straight.

"Manami, cook something. Our guest must be hungry." He ordered not leaving his sight from the red headed boy.

She couldn't disobey her brother's orders if it concerned Karma. But she can't stay put leaving Karma alone with her brother either.

She sighed in defeat as she mouthed "Sorry" to Karma.

Once Manami was out of sight her Onii-san took over.

"Name."

"Akabane Karma."

"Hmm.. The name's Okuda Maiko. Akabane-kun."

"You can just call me Karma, Okuda-san."

"Then call me Maiko instead. One Okuda is enough."

"Uh..sure Maiko..-san."

Their conversation was fast and Karma needs to analyze his answer. He might be asked something odd, and he might blurt out something stupid.

Okuda Maiko and Okuda Manami shared almost the same features. Raven hair and lavender eyes. It's like staring at a male version of Manami. But he was different from her. He was confident and dangerous.

"Maiko-nii. Don't stress Karma-kun!" Manami reminded Okuda Maiko as she returned to the living room putting down some cups of tea.

"It's fine Okuda-san. I'm okay." The red head reassured the science lover but he felt a glare and a chill.

"Manami, change clothes before cooking."

Manami nodded as she headed upstairs to her room.

A deafening silence enveloped the living room. Maiko continued to glare at the red head. Karma feeling uncomfortable in front of a stranger felt that he needed to do something to get out of the situation.

He started to ask randomly.

"Are you still studying, Maiko-san?"

Karma tried to start a conversation but was ended with a single answer.

"Yeah. Third year high school."

Karma tapped his knee as he look away. As he averted his gaze on the raven haired boy he started to scan the living room.

"Maiko-nii. Please remember to never stress Karma-kun with your silly questions."

Karma heard Manami's voice, who was walking down the stairs. He blushed a little but he quickly gained his composure.

Manami wore a simple black shirt and purple shorts that ended above her knee. Her hair was still in braids but what caught Karma's attention was because she was wearing a frilly apron which she probably took with her when she ran upstairs.

Maiko noticed Karma's sudden flustered face. It was time, he thought.

When Manami walked back to the kitchen again, Maiko decided to end the war.

"Do you like my sister?"

Karma doesn't know what to answer. He might say something stupid, so he better give an answer that Maiko will want. He though that Maiko was asking if he like
Manami as a friend.

"Uh..No."

"You mean to say that you hate her?"

But he might probably asking a different question. Karma mentally face palmed, getting out of character in his mind.

"N-no. I mean... I don't just like Okuda-san as a friend but, I like Okuda-san for who she is..."

Upon reasoning out his thoughts, a tint of pink was clearly visible in his cheeks.

"Then what did you like about her?"

"I guess there's no turning back huh?" Karma thought as he calmed himself down.

Maiko was obviously just being a protective brother to her sister. So he isn't one to blame.

"I like how cheerful she gets when we're discussing about chemistry. And how she'd sulk whenever it's about literature. She's different from all the girls that I've come to know. She's one of a kind. That's what I liked about her. I like her in every aspect." He announced as his heart can't stop from beating so fast.

And for the first time, since the moment he saw the red head, he smiled at him.

"I see. Then my permission is enough. You don't have to get Dad's"

Maiko told Karma as he stood up from his seat. At the same time Manami peeked from the kitchen and declared that dinner was ready.

When Karma walked, he felt Maiko beside him. Maiko slung his arm around Karma's shoulder. As he whispered something to his ears.

"Tell you what. Manami's a bit dense when it come to emotions. Especially with love. So good luck. You have my best wishes. Oh and I want both a nephew and a niece."

"I'll keep that in mind. Maiko-san." Karma awkwardly said. As he looked up to Manami, who was preparing the plates.

Karma offered to help the girl. The latter just shyly nodded as the two prepared dinner for three.

"Okuda-san let's just study tomorrow at school." Karma suggested as he sat down.

"If you say so Karma-kun."

"Neh. Why are you calling Karma by first name while he calls you in last?"

His sister then stiffened as she glared cutely at his older brother.

"Maiko-nii..."

"Then...Karma. I want you to call my sister by her first name." Maiko smiled at Karma. But he knew better.

Maiko was testing him.

"Then, Manami-chan." Karma blurted out, mischief was visible in his eyes. Karma also likes her reactions when he teases her.

Manami blushed furiously as she threw a serving spoon to her brother but was easily dodged.

"Young love..." Maiko sheepishly thought as he gave a smug smile.

But unbeknownst to the three, especially the chemist and the prankster. That a yellow octopus was spying outside as his face was pink while scribbling down in his shady notebook.

"Young love indeed. These two never failed to amaze me...KarmaxManami Nyurufufufufu..." Korosensei talked to himself as he continue to scribble down.

A little bit OOC.