Tsumiyuna

Heir of the Kuroyume and Makoto bloodlines, two Magi bloodlines that were both in the decline for several generations. Both families agreed to merge their bloodlines, and Yuna became the families' only hope for a continued existence. 

It succeeded; Yuna was born a far greater mage than her family anticipated. For the first fourteen years of her life, she was homeschooled and a sheltered child. At twelve, she began studying magic, and at fourteen, she was admitted into Areshia Academy's accelerated course study program– a year earlier than normal, and one of only twelve students. Three years later, she was set to graduate after the winter term as the number one elemental mage in the academy. Areshia Academy, as the top academy in the region, rarely graduated anyone ahead– even those who entered the accelerated course often fell behind.

How she managed that feat was known only to herself and her mother. Ashiya Kuroyume had been developing thought acceleration magic in secret, an extremely specialized form of the Kuroyume's enhancement magic, that could speed up the user's thoughts nearly five times faster. The cost however, to use it for any effective period of time, was aura capacity she did not have. While it wasn't outright forbidden magic, as it was newly invented magic, some of the techniques encroached on the territory, so she was reluctant to share it. Until one day, Tsumiyuna encountered her research notes and replicated it perfectly. At first, Ashiya was reluctant in having her daughter be her "test subject", but at Yuna's insistence they ended up working on it together– Eventually near the end of her study years, she managed to pack a day's worth of work into fifteen minutes. She'd often bemoan her handwriting speed isn't up to par with her thinking speed.

Because of this, she'd often be thought of as someone who barely studied, yet aced everything anyway. A cup of caffeine and a few hours of study took care of everything she needed for classes in a week. And because of this, she was constantly dragging her friends, Kamui, Aidryn (then Adrienne), and Alina off to have fun, because between studying and reading and her friends, there was nothing else she particularly cared to do. To Kamui's exasperation, the girls seemed to hivemind their troublemaking, leaving him the only "sane" one of the group. 

Before Areshia however, she only knew two people her age– Emerald and Alina, her cousins. Both of whom she secretly envied because they knew what they were doing in life, or so she thought. Emerald was quite literally, perfect, she thought, and that intimidated her. Alina had strong opinions and weren't afraid to speak of them. And so, like a limpet, she latched onto Alina and her hopes and ideals, and made that her reason to live, and to better herself. She'd convinced herself that her cousin would be someone amazing one day, and she'd support her every step of the way. Plus, if Alina struggled to use magic, what better to supplement that than her inherited aura amplification techniques? 

Her life would come crashing down the summer before she was set to graduate. It was the summer of Emerald's graduation, and it came with a blaze that burned her life to ashes. Areshia Academy. Smoldering ruins. Alina. Dead and body missing. 

She'd barely finish the term at Kokukari Academy with barely-passing grades. And she would continue her bare-minimum living effort if not for Titania offering her a place in the Aura Guardians. Titania was a stickler for the rules, but even she could bend sometimes, and bend she did to assign Tsumiyuna as a strategist immediately. Usually, the position was reserved only for A-tier and above Guardians, with at least two years of field experience. Yuna didn't need either to perform better than most fresh into her role. More gradually this time, she warmed up to Titania, and eventually began clinging to her the same way she did for Alina. This time, she wouldn't let the person most important to her die. 

Fate apparently enjoys mocking her, as not long after that, her parents happened to die in an accident. In every way, it appeared to be an accident– the carriage drivers were driving up a steep mountain road in the rain, and one of the horses slipped, bringing down the entire carriage into the valley below. The driver died as well, and with nobody to blame, the incident was quickly forgotten by the public. But Yuna didn't forget. She was determined to find out how her parents died– almost obsessively so, and eventually found the source– a curse, applied on the carriage wheels, manually tripped to send her parents to death. There was no way an experienced driver and experienced horses would make a mistake on the path returning to their mountain home, as familiar as it was.

But, in pursuing the perpetrator, the trail ran cold, as when they found the mage responsible, he was already dead. There were no other leads. Her family pinned the blame on the Avrians, the noble house who would be most threatened by the Makotos' rise in power. Through and through, they denied culpability, and while the rest of her family didn't believe it, Yuna did her own digging, and found they were indeed telling the truth.

So then, who had killed her parents?