It was a cold day, the breeze frigid and stabbing into peoples' skin. Katsuki hated it. He hated how the cold seemed to slow the day down to a crawl, how it preyed upon those that were sickly and weak.

His mother had come down with a cold once, and he hated seeing her act so weak.

That morning he woke up as usual, angrily preparing himself for elementary school, offhandedly thinking about the chills up his spine. It confused him, how he had this intense feeling that something bad was going to happen, but he ignored it.

Walking down the stairs caused frigid air to clash against him, and he shuddered for a moment before throwing his scarf snugly around his neck. He watched as his dad drank his coffee, reading the morning paper and clearly having a good start to the day.

Katsuki wasn't. Having a good start, that is. He kept these complaints to himself, internalizing the feeling of frostbite creeping onto his body.

"Morning dad." He stated simply, walking to the couch and sitting besides him. Only now he noticed the plate of fresh food on the table, waiting for him, tempting him, but he waited. He'd been scolded more than once for taking food that wasn't his.

"Morning Katsuki. Your mother's still feeling a little ill, so I made your breakfast today... sorry if it isn't anything amazing." He rubs his neck sheepishly as Katsuki begins to scarf down the food, almost finishing his plate instantaneously. "I'll drive you to school. I've taken the day off since it doesn't seem like she's been taking medicine - the stubborn fool!" He adds merrily, laughing to himself while Katsuki could only nod to the 'stubborn' part.

A little later and he was on his way to school, staring outside the window of the front seat and watching things go past. He squinted as he tried to willfully slow down the speed at which things disappearing, but no matter how hard he tried, it didn't work.

He didn't give up for the rest of the trip, determined to continue trying.

Arriving at the school was always a hassle for him. He thought it was always a pain - having to deal with all of the people milling about (extra's, he referred to them as), constantly vying for his attention. Not like he'd even give them the time of day. The nickname for them was quite accurate, in his very humble opinion.

A few minutes later he walked in to his class, scowling fiercely as he eyed the current occupants of the room. His inbuilt anger only deepened as he noticed Izuku (Deku, he cursed) in the corner, scribbling away at a small notebook titled "Hero Analysis #5".

She'd repeatedly showed him the progress of her notes, and as much as he found her collection cool, she never put it to use, so what good was it. In his mind, his distaste for the girl was entirely justified, and a cemented idea within him that she was useless.

The only compliment he'd give her is that at least she's better than these ridiculous extra's, quirkless or not. He'd never admit that, though. The mere idea of someone thinking they're better than him darkened his mood further, so before he could get any worse he sat down next to Izuku.

She looked like a caterpillar, wrapped up in all of those scarfs.

"M-Morning Kacchan!" She squealed. Her voice seemed to tick him off, and he could never figure out why (probably because she's useless, because nothing she says can be important, right?). These words were a common occurrence, but something seemed off today, and Katsuki couldn't put his finger on it.

"Deku." He acknowledged, turning his eyes towards her as he examined her for a moment. Her eyes appeared to sink into her skin, pulsing outwards into her unnaturally pale complexion.

Something was really wrong with her, but he didn't know what.

The day continued to move normally, a mix of common and uncommon events unfurling throughout the day. Katsuki relished any chance he could get to show off his quirk, one fit for a king as he would say. Lunch time just so happened to be the best time to do this.

"Hah! I'm the best, none of you can get anywhere close to me!" He exclaimed, popping small explosions off as everyone fell on there rears, panting out heavy breathes as they stopped running.

The only one who kept chasing after him was the useless Deku (admittedly he was impressed, but he'd never admit that). He didn't realise it at the time, but he was having fun.

If only he had cherished those moments...

They were both laughing, and despite his anger towards the useless girl, his day had gotten marginally better from the physical effort of running. As he ran, however, a soft thud echoed behind him. He turned around, confused, the laughing had stopped - something was wrong.

As he turned, he was reminded of the car trip - how everything seemed to go by quickly, and no matter how hard he tried, he couldn't slow it down.

She'd fallen. He froze for a moment, she just fell down so fast! Katsuki couldn't react, too surprised. He waited, and waited, until he couldn't wait anymore and fear and confusion overran his thoughts, calling out her name for the first time in a long time as he ran to her side.

"I-Izuku! Someone, go get a teacher!" He shouted to the other's, watching as they ran off. He slid beside Izuku, rolling her over from her face-plant into the freezing ground. Her whole body felt like ice, and it stung his hands to hold onto her - her whole body began to turn a purple-ish blue, and her breathing slowed to a crawl, near non-existent.

Now he understood the chills down his spine.

Time flew by. A teacher came. The hospital was called. He, his parents, and Inko went to the hospital with Izuku. Katsuki hadn't cried in a while, and he never wanted to cry in the first place. But this time, it felt like he had to.

"Izuku Midoriya has come down with a rare, incurable disease. I'm... sorry, Mrs Midoriya. We cannot cure her currently, however we can sustain her and keep her up to an... acceptable level of health." The doctor didn't mention the cost, but we all knew it would be high, too high for Inko.

Katsuki hated the cold. Even though it wasn't the cause of what happened, he still hated it.

It was just a reminder of the day it all began, and the beginning of his frequent hospital visits.

AN: I hope you liked this little story idea I wanted to make (not too sure if anyone's done it, if so, well, oof). I'm honestly not sure if I'll continue it, but I think I'll definitely add at least one or two chapters.

Anyways, thanks for reading :)