Full Summary: She is 100% certain Kazuto Kirigaya and her would always be on complete opposite sides of the spectrum. That was a fact, an unspoken but established rule between every single student on campus ever since their first year of college. It was just as irrefutable as the sky was blue and the grass was green. So why...? Why was it that her heart seemed to flutter when he stood too close and her mind seemed to cloud up when his fingertips grazed her skin?

Maybe it wasn't as irrefutable as she'd originally thought... after all, the sky turned gray on rainy days and orange on late afternoons and violet on early mornings and there was not much she could do to stop it.

Enemies-to-lovers!AU

A/N: Welp... Tbh, this was supposed to be a huge ass one-shot, but I figured it would turn out too long, so I decided to split it up and publish it in chapters UwU

Worry not, guys, Diamond Shards is not forgotten! I'm working on the next update, but it'll take a bit longer since DS's chapters are longer than the ones for this fic~

Warning: Rated M for future chapters.

Please, enjoy :3

CHAPTER 1

Kazuto Kirigaya was the bane of her very existence. He was loud, he was obnoxious, he was presumptuous. He liked to get on her nerves just for the heck of it and every particle of her being despised every particle of his being, much like the Grinch loathed Christmas and Squidward Tentacles detested SpongeBob SquarePants. It had always been like that and she couldn't see it changing any time in the future. Everyone on campus knew of their squabbles and for some reason she couldn't begin to fathom, they all just stood there watching, arms crossed and knowing smiles on their faces as she tried her hardest to suppress the urge to jump on him and tear his hair off.

Whenever asked about polar opposites, every student would most definitely point out Asuna Yuuki and Kazuto Kirigaya. She was the sun, he was the moon. She was fire, he was rain. For one to rise, the other had to fall. That's how it was supposed to be. They circled each other in a dance of black and white, so seemingly close but truly very far apart.

Kazuto liked to party. He never missed gatherings of the sort, and he shone brightest at night, when the sky was its darkest and the stars twinkled softly against the black canvas. He slept until late noon whenever he could and did things offhandedly. He was a free-spirited person, the type of guy who liked to go with the flow and see where it took him. Asuna, on the other hand, very much preferred the comfort brought to her by daylight. She always woke up with the birds, had her whole life organized inside her cute little notebook and went about her day according to what she had planned beforehand. Her favorite place to be was the library, where she could study and take care of her duties as Student Council President.

In her mind, they couldn't be any more different, even if they tried. Which is why she can only stare at the paper sheet containing the midterm results for a class she so happened to share with him, and wonder how in the whole universe he had gotten a score above hers.

"Looks like I dethroned our number 1 student," a voice comes from behind her, and she doesn't need to turn around to know whom it belongs too. He sounds cocky, irritatingly so, and she feels the sudden urge to turn around and kick him between the legs. Still, she refuses to lose her composure and give him that satisfaction, so after taking a deep breath to calm down her nerves, she turns to him with an obviously forced smile as her eyebrow twitches slightly.

"Congratulations," she says through gritted teeth and watches as his smirk widens. Keeping her annoyance in check was proving to be a more difficult task than she originally thought. "Do enlighten me, though. I thought you were too busy partying on the weekends to even have the time to pick up a book."

"There are a lot of things you don't know about me, Angel," he winks and she's sure her face is as red as a tomato at this point.

"Stop calling me that," she's seething with rage, but he seems to be having the time of his life as he gazes down at her in amusement.

"Then stop acting like one," he answers easily.

He always has a comeback at the tip of his tongue and it frustrates her to an extent she didn't even know was possible. It makes her wonder if he spends his free time writing down clever retorts to whatever she may say. It makes her hate him even more.

"You know what? I don't have the time nor patience to entertain the likes of you, so if you'll excuse me, I'm going to leave first," she turns on her heel, intent on getting as far away from him as humanly possible, when she feels him grabbing her wrist.

She slowly turns her head to him, lips pursed and eyes blazing with a fire that should be enough to burn him down to ashes. But as always, he pays her no mind, and instead of backing off, he draws his face closer to hers.

"Oh, but you just got here, Angel, what's the rush?"

"Kirigaya, I swear to God if you don't let me go this instant, I may do something that will get me arrested."

"Oooh, I'd very much like to see that… You know, I've always wondered how you'd look in handcuffs," he winks at her mischievously and she stops breathing.

Why her heart just did a summersault inside her chest, she refuses to acknowledge.

Ripping her wrist from his grasp, she huffs in his face and finally walks away, ignoring his laughter as it follows her down the corridor.

"You know, you really shouldn't let him get to you so much. He keeps teasing you because you make it too easy," Alice says one late afternoon as she lays down on her bed in their shared dorm room, popping grapes into her mouth as she lazily surfs through TV channels.

"Easy for you to say that, it's not you who's on the receiving end of his bullying," Asuna huffs as she turns her chair away from her desk to face her best friend, "Alice, he's constantly coming after me with his stupid jokes and even stupider nicknames, it's so goddamn infuriating!"

Alice almost chokes on a grape, patting hard on her chest to calm down her coughing fit. When her breathing finally steadies, she looks at Asuna with wide eyes full of mirth.

"…what?" Asuna says, instinctively crossing her arms over her chest, "What is it?"

"I really need to ask him to teach me his ways. He's even got you cursing, now," the blonde says with a small laugh, before turning her attention back to the TV.

Asuna lets out a displeased sound through her nose. "Shut up, I hate him," she says as she twists her chair, turning to her desk once again. Tapping quickly on her tablet and picking up her pen, she resumes writing her report.

"Sure, you do," her best friend's voice comes from behind her.

Her hand tenses around the pen, Alice's words twisting her stomach in what she convinced herself to be revolt.

She can't find it in herself to answer.

She watches from across the room as he easily smiles and laughs along with his friends, running a hand through his dark hair while slapping Eugeo's – his best friend's – back with the other. Truly, the only reason she knows all of his friends has nothing to do with wanting to know more about him, per say, but more because she believes it is her duty as Student Council President to recognize all of the students' faces and names. She's genuinely not interested in anything related to Kazuto Kirigaya, and she is happy in oblivion when it comes to him.

Yet, at that particular moment, she couldn't seem to take her eyes off him. The fact that they were in the same room without being at each other's throats was, all in itself, a feat definitely worth noting. They were sufficiently far apart to not breathe the same air but still close enough to feel each other's presence. However, he didn't spare her a single glance ever since he got there, nor did he throw her one of his signature smirks when he first walked into the room. It's somewhat refreshing, but at the same time a little bit unsettling. Not because she dotes on the attention he always seems to give her whenever she's within a ten meter radius from him, but because she didn't think he had it in himself to not bother her and leave her alone for so long.

She keeps watching, this time as a cute, petite girl with short brown hair approaches him somewhat nervously. She watches as the girl, whom she knew to be a freshman named Ronye, pulls at her skirt and straightens down the two pigtails at the back of her head. She watches her call out to him, and him turning around to face her with a gentle smile. She watches their interaction closely, noticing the girl's timid giggles and shy glances, and it's particularly easy to read her lips as she utters the word "senpai". She watches him chuckle at her cuteness before patting the top of her head, eyes soft as he speaks to her. She watches as Ronye seemingly gets a burst of courage and, standing on her tip-toes, reaches up to place a small kiss on his cheek.

She tears her gaze away. Wolf-whistles and claps echo around the room.

Quickly gathering her things into her arms, she hastily walks towards the door, not sparing him another glance.

Of course, that was also Kazuto Kirigaya. A well-known lady-magnet, as she'd heard his friends call him on multiple occasions. The kind to go around sleeping with any girl willing enough to open up her legs for him. And he didn't have to do much to get them to do just that. It was easy enough for him, like child's play.

Asuna knew that, she really did.

Still, she can't begin to comprehend why in the world the exchange she just saw between him and his junior is bothering her so.