AN: Okay, so I said that in the first chapter that I would only update if I get motivated to, and so here I am. Please bear with my crappy writing.

This will be a flashback chapter by the way, just to support Rindou's yandere character I set up. I freaking love yanderes, and I won't mind my girlfriend being one (if I had one, huhu).

With that said, I'll be posting more just to fuel your imagination. Oagariyo! (^_^)

…

7 Years Ago

A young Soma was crying to his sister after his seatmate took his crayons. In response to this, Rindou invited Soma's seatmate in a game of tag and injured him by pushing him off the slide forcefully.

After that, Rindou was ostracized by her playmates out of fear and got scolded by the boy's parents. When they got home, Soma cheered Rindou up.

"Don't worry about it, Rindou-nee. No matter what anyone says about you, I'll always be on your side" he said, making Rindou smile at him.

"Really?" she asked happily.

"Of course. As long as we have each other, everything will be fine. Even if everyone picks a fight against us, promise to always be together?" he said, pointing out his pinky.

"Promise!" Rindou exclaimed happily, intertwining her finger with Soma's own.

From behind the living room wall between the staircase and the living room, Joichiro happily listened on.

1 Year Ago

"What did you say, asshole?" An enraged man with blonde hair and ear piercings shouted, holding the front of Soma's shirt as an attempt to intimidate him.

"Didn't you hear me, you brainless loser?" Soma retorted with a serious look.

"Why you… just because you're a little good-looking-!" he shouted as he punched Soma in the face "I hate condescending pricks like you the most" he continued.

"Idiots like you don't scare me. In fact, you're pitiful to me" Soma said with a smirk this time.

"That's what pricks like you say at first. But after I'm through with you, you won't even be able to look at me with that cocky grin of yours" he smirked, cracking his knuckles.

And with that, the delinquent lounged at Soma and proceeded to beat him. Usually, Soma would have won since he had sufficient knowledge on a person's weak points and vital spots. On top of that, he was a black belter in aikido and karate. But his way of fighting was dangerous, especially for a guy who doesn't know how to guard well against trained punches. In the end, Soma just decided to let the guy hit him until he's satisfied.

At the end of the day, he lay motionless on the ground. Contrary to what you're thinking, he was not unconscious or anything. After all, the delinquent still had the decency to hold back. This was merely a lesson.

Seeing the sky get darker, he finally decided to go home 'Wouldn't want to keep Rindou-nee waiting' he thought, remembering how angry she got the last time he went home late.

As he expected, once he got home, Rindou was waiting in front of the door and made a big deal out of the light bruises he had.

She pressed him for information, not promising him dinner if he didn't talk.

"Well, I more or less have an idea on who that guy was" Rindou said after finally calming down from her interrogation.

"You do?" Soma asked, unsure if his sister was bluffing or not.

"A big guy from our school with blond hair and ear piercings, sure I do, he's my classmate. Yamazaki's his name, I think…" she answered, earning her a look of mild surprise by Soma.

"…But don't worry, I'll just talk to him tomorrow. Now, let's get you some dinner" she finished, motioning for him to follow her to the kitchen/dining room.

"I hope you won't do anything too dangerous" Soma warned, aware of how overprotective his sister was.

"Me? No way" she said with a smile.

"Well, in case he hurts you too, then I won't let him off this time" Soma said, making Rindou blush slightly at his concern for her.

"I already said I won't do anything like that" she said playfully.

"Yeah, yeah" Soma said, earning him a playful punch on the shoulder from Rindou.

"Speaking of which, I baked too much strawberry cookies earlier in Home Economics class, want some?" she asked.

"Of course I do. I'll eat anything you make" he said confidently.

And thus, the night ended with Soma eating dinner in front of his blushing sister.

2 Days Later…

"Rindou-nee! Wake up!" Soma said as he started shaking his sister awake.

Rindou looked at Soma with half-lidded eyes.

"Soma… Wake me up in five minutes" she said groggily, still half-asleep.

"What are you saying? We have an hour left before school starts" Soma said, pointing his thumb at the clock on the wall.

Rindou lazily turned her head at the clock and in a sudden look of surprise suddenly ran to the bathroom.

"Crap!" she exclaimed.

Once she made it to the bathroom, she was frantically looking around looking for something.

"It's not here" she said despairingly.

Meanwhile, as Soma was busy making their bento, he was broken out of his thoughts when he heard the morning news.

"Speaking of being safe out there, a boy with multiple stab wounds was found below the bridge. The body was identified as that of a third year junior high student at Sumire Middle School" morning news anchor A said.

"What could have been the motive for his murder?" Morning news anchor B asked in return.

"Apparently, he was quite the troublemaker" morning news anchor A answered.

"Isn't that normal for boys his age? No matter what he could've done, murder was still taking it too far"

Soma didn't notice Rindou watching the news intently with a serious look on her face and was startled when he noticed her standing in the entrance of the living room.

"Were you there this whole time?" he asked, earning him a simple "Yeah" from his sister.

"That guy that was just murdered… He was the one who assaulted me yesterday" Soma said.

"Thank goodness…" Rindou subconsciously mumbled out. Fortunately for her, Soma wasn't within earshot.

Soma's eyes widened for a second.

"Huh? Did you say something?" Soma asked.

"No" Rindou said with mild surprise at the fact that Soma might've heard her.

"Anyway, let's eat before we get even more late for class" Soma said, taking his seat.

While they were eating, they engaged in a rather uncomfortable conversation.

"Did you go somewhere last night?" Soma asked.

"No"

"Then why was one of your socks in the hamper when I took a bath earlier this morning" Soma asked, eyeing her suspiciously, not missing Rindou's mild look of surprise.

"Was it the left or right sock?" she asked.

"Does it matter which pair it was?" Soma asked in return.

"Just tell me which one it was" she continued.

"Like I said, what does that have to do with anything?" he persisted, finding it strange whys he wants to know so badly.

"I just wanna know, ok? Now, please just tell me" Rindou said with gritted teeth.

"You're acting strange. I won't tell you unless you tell me why you wanna kn-" he was cut off when Rindou slammed her hand on the table.

"SOMA!" she screamed out, eliciting an immediate response from him.

"Left. It was the left pair" he said quickly, surprised by her outburst.

Rindou let out a breath when Soma answered.

"Thank god you didn't see the bl-–" she cut herself off before finishing her sentence, subconsciously muttering it again in the heat of the moment.

"Hm? Didn't see what?" Soma asked, continuing his interrogation.

"Bleach" she answered.

"Bleach? For what?" Soma wondered.

"Oh, you know, for my hair" she said.

"For your hair? Then how did it get on your socks?" he asked once more.

"I was just being clumsy as usual" she said, bonking her temple cutely.

"Well, that explains things" Soma said blankly.

"Hey, what's that supposed to mean?!" Rindou asked in mock irritation.

"I wonder?" Soma teasingly said.

"Why you-"

And thus, their morning carried on with their usual playful antiques, not aware that they were already late for school.

In class, Soma looked out the window, connecting together the events from earlier.

He lied about which pair he found because he had a hunch. When he found the right pair on the bathroom floor, he saw that it was just in front of the hamper, so Rindou must have dropped it after getting other clothes to the laundry. Finding it odd, he picked it up and noticed that under the sock, it was drenched in something red and sticky. Thinking that it was just the strawberry cookies she made the other day, he brushed it off. Even so, he didn't know why he felt uneasy. Remembering when Rindou once seriously injured the boy who bullied him before, he started thinking 'What if…'

When he heard the news, he immediately remembered his conversation with Rindou after he told her the story. When he saw her watching the news with a serious expression, he was startled by her presence. He told her about the victim, and was surprised when he heard her mumble something. Deciding to confirm if he was just paranoid or not, he asked her if she said something to see if she would lie or not, and as he feared she did.

When he brought up the topic about the sock, his doubts have finally washed away. Seeing her acting so strange, and catching on to her slip of the tongue, he pieced the puzzles together.

Ever since that day, Soma made sure to take care of himself not only for his sake, but also for Rindou's… and for the unlucky person who will invite her anger.

…

So, how was that? It's a glimpse into the extremes Rindou will take (or in this case, since it's a flashback-took) for Soma. I'm trying to paint her as this obsessed yandere sister. It just feels more fun to write and think about, don't ya think?

I just hope that my story somehow encourages the crack ship Rindou x Soma. I know there is a 0% chance of it happening in the manga, but that's the purpose of fanfiction, right? To create a world of ideas. Hopefully, in time, I can visit the Rindou x Soma ship and see a lot of stories to fuel my spirit. This crack pairing is special to me since it was what opened my eyes to venturing outside the canon pairing. Now, I ship crack pairings in almost every series I support. Matta ne! (^_^)