"If left alone, Misaki Yuki will cause mischief."

This fact had become well-known by the entirety of Yudaitaka High School in the two months since she transferred in.

Despite being near the end of the school year, her arrival was not treated as anything peculiar. After all, Yudaitaka boasts the title of the easiest hero course in the country. We're chock-full of wannabe heroes who failed to get into a decent school. Naturally, we also pick up any stragglers that end up dropping out of any potential better school. In fact, we had a dozen drop-outs from U.A. at the beginning of the year. It was pretty hectic back then.

Anyway, we all just thought this girl was some big shot that ran into trouble with U.A., Tsubasa, or some other big school. That, coupled with the fact that she's sort of cute, in some roundabout fashion, made her appearance quite the buzz. Our classroom was swarming with students from other classes, trying to either find out where she was from or inviting her to join their club.

If she had just spoken up sooner, everyone would have figured out what a weirdo she is and just left us alone. Unfortunately, that atmosphere continued for a few days before dying down.

Once everybody's eyes were off her, she disappeared. She left during lunch break and ditched the rest of the day. Some people thought she may have gotten sick and went to the infirmary, but we found out the next day what she was up to.

To backtrack a little, Misaki went to visit most of the clubs in their assertive attempts at recruiting her. While there, she ended up hearing a story from earlier this year.

I don't actually remember the girl's name, so let us just refer to her as 'Girl X.' I am sure she would prefer that for the sake of privacy, as well.

Girl X was a member of the art club and went missing four years ago.

That was the whole story. Misaki heard that, and exactly that. The only other thing about Girl X she knew about was an unfinished painting of hers hanging up in the art club. It was what she was working on at the time before her disappearance. Nobody had wanted to be the one to throw away a presumably dead girl's last painting. Personally, I am surprised it didn't end up with her family, but it's not like I know the details.

Back on topic, Misaki disappears during lunch break and never comes back to class that day. That would normally be a tale of a delinquent skipping class to go hang out in some shady alley or something. Well, she came back the next day, and let me tell you, she was pissed.

Nobody dared to talk to her, but it was evident from her facial expressions and body language alone that she fuming. Before now, she had only ever looked at us with her regular listless look, so this was an entirely new side to this mysterious transfer student.

During lunch, once she calmed down just a tiny bit, a couple of girls worked up the courage to invite her to eat with them. Confronted with fear itself, one of them then managed to show the bravery being a hero necessitates and asked her what was wrong.

Me, who happened to sit right next to Misaki, heard the whole thing.

"Even until the very end, he didn't admit it," is what she said, more or less. She ranted on and on, only vaguely detailing the situation. The only clear details I heard were of her confronting someone, and the school reprimanding her for it. The two girls sat there with her looking dumbfounded, as Misaki spouted for the remainder of the lunch break. All three of them ended up not touching their lunch that day.

However, just before lunch break ended, one fool ended up asking her what the hell she was talking about.

"Sorry for eavesdropping, but seriously, what are you talking about?"

The girls she was sitting across from seemed ever so grateful that I butted in. It was my first time talking to Misaki, and while I would have loved to have continued to have nothing to do with her, my curiosity was far too piqued by what she had said.

Looking at me with disdain, she replied.

"Huh? Didn't you hear earlier? Teacher Y killed Girl X."

Coincidentally, that same morning came with the announcement that the teacher in charge of the art club (whose name I have since forgotten) would be retiring, and the art club would temporarily suspend activities.

Pardon my poor narration, but the story is more fun this way.

The entire class, now revealed to be eavesdropping along with me, went quiet at this. Naturally, nobody believed her at first. Our next class ended up starting a minute after she said that, so nobody had time to further question her about it.

By the time that class had ended, everybody had either forgotten about it, or deemed Misaki a loon. We all went home pretending to have never heard anything, confident that Misaki was in need of a psychiatrist.

Well, the next morning, it was all over the news that one former Yudaitaka teacher was under arrest for the abduction and murder of Girl X.

I never heard the complete story from Misaki, so all I know are rumors going around class.

But please, let me present the hypothetical timeline of what went down.

Of course, Misaki first learns about Girl X from the art club. Intrigued by it, she ends up looking up who she was online.

A few days later, once she is no longer being bombarded by her peers, Misaki sneaks around the school looking for something. If this were a recent crime, there would probably be evidence left behind if anything happened at the school.

But this was four years ago.

Even if there was some critical piece of evidence at the school when she went missing, it would have been long gone.

But Misaki found something. I have no idea how she linked Girl X and Teacher Y together in a crime, but she did.

I tried to ask her what she found, but she refused to answer. She said she had no reason to linger on such a boring case. Personally, I think she just said that because she knew I was curious.

Anyway, with Evidence Z in hand, she did the responsible thing and handed it over the police, right?

Of course not.

Suspecting this man was a dangerous criminal, she chose to be completely rational about it and confronted him alone at his house.

Now, if Misaki had some sort of physical Quirk, this would not be too bad. There are lots of kids—adults too, even—that like to take justice into their own hands. Those people have Quirks to back them up.

Misaki doesn't.

While she claims her Quirk to be called Deductive Reasoning, she is almost definitely Quirkless. Atleast, I have come to believe Misaki is a gifted—albeit weird—genius who happens not have a Quirk.

Of course, I have no proof of this. For all I know, she could have a Quirk called Deductive Reasoning. For one reason or another, though, I just cannot believe her.

Either way, she does not have a Quirk fit for vigilantism. Even during physical education, she is almost always behind the rest of the class. Keep in mind that Yudaitaka is known for having an extremely lenient hero education.

So this tiny girl goes and confronts Teacher Y, accuses him of murder, probably taunts him while she's at it, and eventually the police show up and arrest the guy.

By the way, I heard there was a knife in his pocket when he arrested. He probably picked it up and prepared to use it when Misaki accused him of, you know, killing someone.

I am sure she would have just laughed if he pulled it out on her though.

According to some news articles I read after the fact, a 'daring Yudaitaka student' submitted some crucial evidence to the police that ended up arresting him. Teacher Y was also accused of blackmailing and raping Girl X, but prosecutors were unable to charge him for it.

Anyways, that's the story of how the entire school learned the name Misaki Yuki. A few people praised her for what she did, but most people ended up scared of her once people starting gossiping.

When I asked her why she was so mad that day, she explained it in a way 'that even a nitwit like you could understand.'

"It's no fun if the criminal doesn't confess at the end, you know? Just think about how boring it would be if you got to the end of a 300 page novel and the accused denied doing it until the bitter end? There's no resolution there! Of course Teacher Y did it! They even ended up finding her body! But if he doesn't say he did it and then plead guilty, it takes all the fun out of it."

That's everything. Misaki has made a few waves around Yudaitaka since, but nothing she has done since has come as close to getting a teacher arrested for killing a student.

Personally, I just hope it stays that way.

Thanks for reading, everyone! It goes without saying that I would appreciate some feedback about how you liked this opening chapter. There's probably some typos I missed, but I'll try to clean them when I get the time.

I have actually written two MHA fanfiction's before, but both of them were pretty bad for similar reasons. I have since taken them down, since they would otherwise remain a blight on my consciousness.

The protagonist of the more recent one had a protagonist very similar to Misaki, but it followed the events of MHA itself.

While I tend to dislike fanfiction which is almost entirely OC's, I feel like there is room to grow in this fashion. While this story will not be very action oriented, it will have some tie-ins to the canon events of My Hero Academia (eventually.) Particularly, I would like to tie into the Stain arc, but the exact details are still uncertain.

Anyway, I hoped you liked the prologue. I realized what I wanted this chapter to be was similar to Haruhi's opening segment, so sorry if the narrator ended up sounding too much like Kyon. Just for reference, Misaki will be the one narrating the rest of the story.

As previously mentioned, I would appreciate any feedback you have for me. I am trying to practice writing with this story, so if you have any problems with my prose, please feel free to point them out.

P.S. While I highly doubt anyone will be able to reverse engineer it, bonus points to whoever gets what Yudaitaka is a reference to.