Disclaimer: I do not own Assassination Classroom or anything associated with it. I only own the OC Hiyashi Mizuki and her siblings. All rights go to Yusei Matsui.

A/n: Okay, here's the deal and the spiel. This is my first fanfictions as well as my first attempt at writing anything really so please don't be too harsh. I wouldn't mind some constructive criticism because I'm really looking to improve my writing. Also the fic will mostly focus on how the OC handles being in AC but there will eventually be a pairing that will either be chosen based on me or what you guys want. It really depends on how many people actually read this lol. Last thing I swear, the first few chapters are mostly building backstory and personality for my OC so it might be a bit dull but please bear with me.

Alright here's the story. Enjoy:)

Character's thoughts

Character thoughts in flashbacks

Hiyashi Mizuki loved her siblings but sometimes they could drive her nuts.

"Please don't make us!" her little sister wailed as if the world was ending.

"We've done so many today. You said only ten pages of the math workbook. Ten!" Her little brother, and her younger sister's twin, whined right next to her.

Sighing, Mizuki closed her eyes and counted to five. Giving them a break couldn't hurt. They are only five years old.

"Fine. No more math today. Let's go get some of that ice cream I promised you."

"Yes! Yes! Yes!" they cheered loudly.

"BE QUIET YOU BRATS!" came a yell from the living room. All three of them froze in place. Putting her finger to her lips, Mizuki silently ordered her siblings to be quiet as she got up to confront the monster living in the other room.

Her footsteps were nonexistent as she crossed the wooden dining room floor into the messy family room. Sitting in his usual sofa chair in front of the television with a half drunk bottle of sake in hand was her father. Well, her father in name not practice.

In an attempt to appease him, she bowed her head, braid falling over her shoulder she lowered her hazel eyes to the floor, and murmured, "I'm sorry we disturbed you chichi."

He stared down at her with his dull brown, soulless eyes. Raising the hand without the sake bottle, he backhanded her across the face causing her to fall to the floor.

"You're lucky I'm feeling generous today. Next time I won't be as lenient. Get out of here and let me enjoy my show." He grunted in his gruff drunken voice before turning back to the television.

Mizuki stood up quickly and retreated back into the dining room where her siblings sat huddled together. Giving them a look that told them to follow her, she led them to the front door and grabbed her purse before they stepped outside.

Immediately, her siblings started fussing over her.

"Are you ok? Do you want some ice?" Their worried voices overlapped each other until she could no longer hear what they were saying.

"Don't worry. I'm okay," she said, giving them a soft smile to reassure them. Rather me than them. A black and blue bruise already started forming on her cheek. She knew she would have to use concealer the next time she went out just in case; after all, she couldn't let what happened last time happen again. For now, however, she could just use her jacket collar to cover it.

As children, her siblings didn't know enough to see through her lie, so they smiled and thanked her before grabbing her hand and running down the street to their favorite ice cream vendor.

After buying them their soft serve ice cream, she brought them to a park where they could eat in peace then play with each other and others their age then took to the trees at the edge of the park. Climbing up the trunk, she sat on one of the lower branches and stared up into the sky. Spring break was ending soon which meant she would have to go back to school soon.

School means no jobs *sigh* can't afford to risk that again, she thought, closing her eyes, her mood dampening at the memory.

Juggling three jobs over the spring was hard, but it at least allowed her to make enough money to support herself and her two younger siblings. Besides, school rules stated that students were not allowed to work during the school year, so she had to make as much as she could before the semester started.

Mizuki lived the classic cliche troubled family life. After her mother died in a car accident, her father had become a drunkard (though he had often gotten drunk while she was still alive) and had stopped working and caring for his children. As per cliche, they reminded him too much of their mother which made him unable to bear the sight of them much less take care of them. He had enough money to allow him to support himself without work, so, a few months after the accident, he just stopped; told her that they'd have to get their own funds. In hindsight, they had really lost both their parents that day.

The only saving grace was that her mother had left the money she personally saved up to her children in order for them to attend the richest and most successful junior high in Japan, Kunugigaoka Junior High School. As of now, her siblings were too young to attend; on the other hand, however, she was going to be on her last year there.

Her first year, before her mother died, was the best year of her life. She had graduated top of her class in elementary school with positive remarks from all her teachers and classmates. The first year was a breeze for her. She easily made it to the top of the class right behind the chairman's son Gakushu Asano putting her on his watch list after first semester final exams.

Flashback

"Ohayo, Hiyashi-san."

Looking up from her book, Mizuki glanced around to see who had called her name, but everyone else around her seemed to be studying as they walked. *mental eye-roll* They know no amount of studying will change the results of the final exams right? We don't even know the placing yet.

Unable to find the person who had called her name, she glanced back down at her book, ready to dive back into the story when a hand landed on her shoulder. Startled, she dropped her book and started to tip backwards.

"Ahhhh!" she cried as she spun her arms to regain her balance. Just as she felt herself falling backwards, she felt a pair of hands catch her shoulders to keep her from falling. She glanced behind her into the face of Asano Gakushuu, the most powerful and popular student in the whole school despite only being in his first year.

"Are you alright Hiyashi-san?" He asked in a polite voice.

"Aa, arigato gozaimashita Asano-san," she replied with a small blush on her face. "Ano, could you let go of my shoulders?"

"Oh, of course," he said, releasing her before bending down to help her grab her book. "Ah, The Diving Pool is a classic."

"You've read it? What did you think?" she said excitedly

"It was a good read, not my favorite though."

"Aw that's a shame. Anyway, thank you for catching me. Did you happen to be the one who called my name?" Realizing his voice matched the one from earlier.

"Ah yes, I have a proposition for you."

"A proposition?" she inquired, puzzled. What could the top student and director's son want from me?

"Hai, apparently you scored right behind me in the overall points for the final exams. I wanted to invite you to be a part of an elite group, the Big Five, that I am forming for the top students of this school. The others will come from the other top ranking students in each of the five core classes. I was the top score with a perfect in almost all the subjects; you were right behind me, missing my score by only ten points, and your English paper was top out of all the students. I already have three others in mind, but I wanted to ask you permission first," he replied with his trademark smile that won over every girl in the school. "So what do you say Hayashi-san?"

"Being invited to such a prestigious group? What an honor," she saw him smirk and knew he was assuming she would want in after falling for his pretty boy smile, "however, I have to know the purpose of this group, or is the purpose to strut around like royalty?" she finished in a flat tone that communicated her displeasure at the thought. Based on the rumors and what she had vaguely observed of him in class, she knew he was manipulative and power hungry. Having his own group of students to do his bidding would ensure his rule over the school. Really, the name should be the big one and his four minions.

Gashuku's eyes narrowed marginally, but enough for her to notice. Ha! Caught him off guard *mental smirk*

Regaining his composure, he responded, easily lying without changing his facial expression, "Of course not. What do you take me for? The main purpose will be to make the decisions of the school body as well as helping other students with their class work should they need it."

"Oh," she replied naively. Maybe he isn't as bad as I thought. She was taken aback. She had thought he really did want to strut his intelligence and intimidate others. Smiling at him with a genuine smile this time, she cheerfully said, "In that case, I would be honored to join."

End Flashback

That was the start of an almost two year friendship. Out of the other three, she was the one Gashuku was closest to and vice versa. They often went out for meals together to discuss topics beyond the scope of their classes. In their interactions, she learned of his poor relationship with his father, the Chairman, and how his mother left them after being unable to deal with his father. She felt sorry for him and guilty that her family was so much warmer than his; she had attempted to invite him over numerous times, but he had declined. Unbeknownst to her, he had felt that their friendship was growing too close and he was afraid of the consequences of having something his father could use against him. The Chairman had already brought it up once or twice to him when he had asked permission to go out to study with a friend.

Despite not being able to get him to visit her home, she decided to hangout with him everywhere else. She enjoyed his company, but more importantly, she knew he needed a friend who could be there for him just to be there. After he had talked her into joining the Big Five, she decided to observe him more carefully. He was always surrounded by people. Always. The guys clearly wanted to be friends with him to be associated with the most talented and powerful guy in school; the girls all liked him because of his suave facade. In order to control all the others around him, he put up a fake personality to make himself more likeable, but it was exhausting him. She could see it in his eyes. His lonely eyes that lacked the warmth of the eyes of regular people. Her mother had taught her from young to always extend help to those who are in need of it; be it company or acts of service, a little kindness always goes a long way she had told Mizuki.

Somehow, she had managed to slip past his guard and the person she found behind the mask was someone she was genuinely interested in befriending. By the time midterms rolled around, both of them had markedly improved (as much as top students could) their scores, but Gashuku still managed to outperform her by a few points. She was sure she would beat him for the final exams and had planned to spend all of fall break, when she wasn't hanging out with him, studying so she could knock the king off his pedestal in their friendly competition. Then the accident happened. During the first week of fall break, her mother was involved in a three way accident that killed both her mother and another man, Yuma Isoshi. The drunk driver that caused the crash was badly wounded and still in a coma, but her admittedly ashamed satisfaction over his condition did nothing to bring back her mother.

Mizuki had retreated into herself. She stopped talking to people. She rarely got out of bed. She barely ate. Looking back, she felt guilty for leaving her younger siblings to deal with their mother's death alone. Perhaps that's why she feels so protective of them now; no matter why, she would never leave them to fend for themselves again. Due to her depression, she had fallen behind in her studies. Her friendship with Gashuku had suffered as well; he had tried to visit her and ask her if she was alright or if she wanted to study with him, probably an attempt to take her mind off of her mother's death, but she had declined, preferring to go home and cry alone. He had even gone as far as to get her a gift, risking rumors spreading about the nature of their relationship to his father. She politely accepted the gift, but it had little effect.

She was only snapped out of her depressed state after two incidents. The notice that showed up after she started her second year that if she kept her grades up she would be kicked down to End Class. While she didn't have the same prejudice against the people who were in class E, she still knew that her future would suffer making her mother's sacrifice to pay for her education there be in vain. So, she sucked up her grief and threw herself into her studies until she was back on the top. In fact, she managed to beat Gashuku in the final exam for the first semester of their second year due to his mind wandering to her wellbeing and her complete absorption in studying any and everything. She did not feel any of the joy she thought she would feel, nor did she feel the childish urge to tease her friend about it. She simply accepted it as a fact and moved on with her life.

The second incident was the first time her father had snapped. Her siblings had started crying over some small thing as all children do. Her father took one look at her face and went into a rage, yelling at the twins and slapping them both to shut them up. Mizuki figured out later that her face, which resembles her late mother's the most with her hazel eyes and light brown hair that shone almost maroon in the sun's bright light, had reminded him of what he had lost causing him to lose his mind.

As his condition deteriorated until he was no longer a father but a drunken stranger that allowed them to live under the same roof as him, she realized she would have to work to support her and her siblings other needs or they wouldn't be able to eat without getting a beating every time they asked for money or until he kicked them out.

Mizuki went the next day to find a job. Knowing the school rules, she had chosen a job in a different city and asked to do the later shift when she knew all other students would be either asleep or studying. Time, in addition to her newfound responsibility to her siblings, helped her reform a part of herself that had died with her mother. She had reached back out to Gashuku and thanked him for everything he had done for her. Soon after, their friendship had been rekindled to what it had been before. Or so she had thought.

During the last couple of months before the end of their second year, Mizuki had been in the diner, serving her customers as usual when an unpleasant surprise walked through the door. Asano Gashuku. Seeing her friend normally brought her joy, but not tonight. Not when his orange/violet eyes widened in surprise when he spotted her in her uniform, holding a tray of dirty dishes. Not when she knew he was the Chairman's son with a responsibility to report any student breaking the rules.

Their eyes met; orange on hazel. Quickly setting down the tray, she signaled for one of her co-workers to take over for her for now and untied the black serving apron around her waist. She knew she wouldn't like what was coming but she had no idea how bad it truly would be.