A/N: Yo! Welcome to the first Magi/BNHA crossover on this site! Few things to get off my chest, before we start. I love, love, LOVE Boku no Hero Academia. All the characters, the story, the humor... I don't think I've ever fallen in love with a series this quickly.

On the other hand, even with my... less than enthusiastic opinion of Magi lately, the thought of this crossover wouldn't leave me alone. Like! Imagine, guys! Dungeons! Huge, scary, deadly! Full of shiny treasure. Space and time bending. Perfect place for some class bonding, right? Haha, well no, Aizawa would probably strangle me with that scarf if he heard me, but bleeeh. Supernatural dungeons full of deadly monsters, and a bunch of hyperactive heroes-in-training? Recipe for a disaster, right there. Hopefully a fun one.

So anyway, ideas showed up, fingers typed, and this happened. This chapter is mainly just setting things up. Next chapter, we dive right into the action, and boy, is it gonna be fun. So! Any questions, critics, confusions, hit me up! Think I got a character wrong? Let me know! Heaven knows I've only been in both of these fandoms for a relatively short time and I'm prone to messing up.

Running the risk I might be a bit redundant, still wanna point out: BNHA timeline, this takes place after Kamino, but before Provisional Licence arc. Magi: info is not relevant yet, but let's just say that Magnostadt arc is going to change very, very much.

So, without further ado, let's go! Plus ultra!

~x~

Chapter 1: Monoma guesses right, for once

~x~

There were many things first year, class A of the prestigious Yuuei Academy was famous for. Made up of some of Japan's most brilliant young minds striving to become the greatest heroes the world had ever seen, shaking up the playing field was only natural. But this generation might've taken it a little too far. Tackling a villain invasion head on twice? Check. Dominating the sports festival? You bet. Indirectly leading straight to All Might's early retirement? Err, kind of. But we're getting a little ahead of ourselves here. The point was, Class 1-A was well known for getting into all sorts of trouble, in school and out.

So. When an explosion worse than 8-degree magnitude earthquake rocked the entire Yuuei campus, it wasn't that big of a surprise to find it coming from 1-A classroom.

"Calm down, it's just Bakugou throwing a tantrum again," Monoma said, in a half-hearted attempt to wiggle himself free from underneath Tetsutetsu's elbow currently digging deep into his lower back. Wasted effort, considering his bigger and stronger classmate was too busy wrestling with a squishy chair to notice. Thus, making doubly sure Monoma would get stuck with a nice batch of ugly purple bruises for the rest of month. "Would you keep still, for a second?"

"HUH!?" The outraged, are-you-asking-for-a-fight growl died down when Tetsutetsu realized the floor couldn't possibly be quite that squishy. "Er, Monoma? What the hell are you doing down there?"

"Fighting asphyxiation, duh. Get off."

Ironing his body, Tetsutetsu pushed the chair half across the room, before helping his softer friend up on his feet. Then both froze, staring at the utter mess their classroom had become. Most of the notebooks, pens and assorted supplies had ended up all over the floor, if not crushed under the weight of wrong-side-up desks and spinning chairs. One of the light bulbs had come off and shattered into millions of glassy pieces right at the teacher's desk. Three of the hinges holding the whiteboard in place had snapped, leaving the surface far off-center, with the last hinge only barely holding out.

Kendou stood up, dusting off her skirt, and sweeping a look from one side of the room to another. Most of their classmates began to rise as well. "Is everyone alright?"

"Yep."

"All good!"

"Here too."

"What the hell was that? Didn't know that Bakugou kid could pull off explosions like this. That's just crazy unfair."

And that's putting it lightly. Monoma picked up his phone from the ground, grimacing at the broken screen. Turned after Kendou when the girl rushed past him, to perch on the window. "Whoa! Looks like they felt it all the way down there, too! Are you sure this was just Bakugou going all explosion gung-ho? It's a little much, even for him."

Glancing back towards his cracked screen, Monoma rolled his eyes. "As if anything is too much for an idiot like him. Explode this, explode that, explode everything! Him and the rest of the class A guys. Can't go a week without getting on the front page for something—"

Kendo sighed, unimpressed. "Your pettiness is showing. Are you sure you're not the only one taking this inter-class rivalry a little too seriously?"

"Too seriously?" Monoma repeated, scandalized.

But the classroom door slammed open, cutting off whatever other rant he'd been intending to start. Another one of the hinges cracked, and they collapsed down with a deafening crash, raising another cloud of dust. Still in the doorway, hand scratching under the bandanna, usually abrasive Awase winced. "Crap." Quickly turned back towards the rest of the shaken classroom. "Anyway. Teachers just went through, it's definitely 1-A. Said something about this being the time to try rescue maneuvers, too, but I wasn't really listening."

Kendou's eyebrows shot up. "You do know somebody could be hurt out there, right?"

Awase shrugged. "It's 1-A. Do you really want to know what they got themselves into this time?"

Monoma definitely didn't. But he had a feeling that wouldn't matter, either way. Giant cracks in concrete couldn't be hidden easily, not even with Cementoss-sensei going all out with his efforts.

Shock value and a giant crack in the wall nobody could truly explain aside, Yuuei didn't really suffer that extensive property damage from the explosion. All the west wing windows shattered from the shockwave. A lot of desks got smashed around. But considering the usual damages when powerful Quirks lost all control, this would've barely ranked mild degree damage. If not for the fact that the explosion itself had been a total freak accident.

First ones heading to the scene, Present Mic and Ectoplasm had been just about ready crack a set of jokes (good, funny jokes) on Aizawa's tab, what with the man owing them drinks and all. Mic had been dead sure Midoriya and Bakugou wouldn't last a week before getting into a fight, much to Aizawa's claims to the contrary. But most of those jokes floated right out of his mind when, in the hallway leading up to the 1-A classroom, they found the class president. With a single finger stuck out, he looked like a disapproving grandmother just waiting to scold her unruly grandchildren. Ruining the picture, though, he had yet to pick his jaw off the ground.

"Class rep? Oooiii, class rep!" Present Mic tried waving a hand in front of the boy's unblinking eyes, wrecking his brain for the name. "Iida, right? Oi, oi, kid, what happened here? Whole thing felt like somebody dropped a bomb on this place. Your boys getting in trouble again?"

Valiant defense of his classmate's misbehavior wasn't something Iida often did, most the teachers had learned that by now. But for that jab to be met with nothing more than utter silence, Mic had to admit was more than a little unnerving.

"Iida?" he tried again.

"T-t-there—" the boy said, muscles of his jaw working like some rusty old piece of metal. Trembling finger pointed towards the door frame. "They were right there."

"Huuuuh? You're gonna have to be a little more precise, kid, I have no idea what you're trying to say."

Clearly not taught by previous experience, Iida seemed to have even more trouble getting the words out the second time. "T-they're gone. All of them. All gone."

"Sheeeesh, what is that supposed to mean? Gone? I thought—"

"Mic?" Ectoplasm cut in from the classroom door, voice as serious as it had been in the wake of their first meeting concerning All Might's premature retirement, which at this point could only be a bad sign. "Drop it. The boy is right. The entire class is… gone."

Mic took a moment to process that notion. And then, in typical Mic fashion, he screamed. "WHAAAAAAAT?!"

In spite of certain grievances some might've had with him, Monoma's spiteful prediction had been proven correct in less than two hours. By 10AM on that sunny and warm September morning, mysterious disappearance of class 1-A of the highly esteemed Yuuei Hero Academy had ended up overtaking the homepages of all the news boards in Japan and wider, had sprung several hundred forum discussions and as many conspiracy theories, many of which had gone as far as to link the event with the recent Kamino incident and the League of Villains rising.

Within minutes of the mysterious explosion, Principal Nedzu had assembled a team of highly competent and experienced investigators to shed light on the incident which was bound to put another gaping hole in Yuuei's already thoroughly shredded public image. But no amount of knowledge, effort and resources seemed to find any hint of what sort of mishap had befallen the hapless students.

After weeks and weeks of thorough research, countless experiments, and lack of any substantial clues that could shed light on what happened that morning, it was only a matter of time before somebody proposed a theory, a hypothesis that was so far out there, that it could only ever be possible in fiction.

"What if it was a dimensional portal of some kind?"

It was absurd. Beyond all reason. According to some, not humanly possible. But Quirks that tended to shape reality in ways nobody could've imagined before, and only time would show whether the nature of a Quirk user warranted condemnation, or support. Besides, after the investigation had led them in blind, endless circles for an unreasonable amount of time, it would be too presumptuous to eliminate such a concept from the realm of possibility. Who was to say a poor unfortunate soul hadn't somehow ended up with a Quirk that could warp dimensions? There were certainly more mind-boggling abilities out there; All For One, however terrifying, merely scratching the surface.

Principal Nedzu wasn't the type to dismiss such a development, regardless of how controversial it might've seemed. And fortunately, same went for the people working with him.

Less fortunately, his investigators weren't going to make much progress on proving their hypothesis, let alone fixing the issue, not with the school under unhealthy amount of public pressure and scrutiny that would only get worse with time, All Might's withdrawal from Hero business that would give way to a number of crimes rising, and the League of Villains lying in wait. Worse, with no evidence, how could they even convince themselves of such a ridiculous story, let alone anyone else? Happens, when the powers that quite literally kidnapped your students come from another world altogether. But Principal Nedzu will be pondering that thought soon enough. He's not a super intelligent rodent for no reason, after all.

As for the class 1-A? Well.

What started out as a typical Tuesday morning was going to go off the rails faster than any one of them could've predicted, and only the best would rise to the top. but before we tackle that, there is one more thing left to address. Whether through a deeply ingrained sixth sense for all things class 1-A related or pure dumb luck, Monoma got one more thing right.

It was all Bakugou's fault.

And, for better or worse, it'll be a long while before anyone figures that out. Bakugou Katsuki included.