Quirks & Flames

by Nurikuro

Summary:

In the blink of an eye, the world changed. Two worlds became one. Suddenly some quirk users have things called flames and some flame users have things called quirks. Why is it that only some people know things are drastically different and why does it seem like they were never separate worlds at all? Who caused this change and for what reasons?

Sporadic updates

Notes:

Hi. I don't know what I'm doing and I'm very nervous so I'm throwing this self-indulgent mess at y'all and running. 🏃🏃🏃

Chapter 1: Universes Merge

*Revised*

 

It happened in the middle of the night, just a regular, boring school night. It happened in the blink of an eye so suddenly that even those awake wouldn't have noticed it anyway. Somewhere out there at that exact moment in time, a peacefully sleeping young man jolts in a full-body shiver. It didn't seem to wake him all the way, but it did put a frown on his sleeping face. Later the following day, that boy would shiver again and have a sense of Deja Vu. He would think back on it and realize that must have been the first warning sign.

* * *

Tsuna woke with a start just in time to get an armful of kids jumping on him and yelling. He fell over with an 'oof' and looked up at the kids on him.

"Tsuna-nii, wake up!!!!"
"Mama said to come to wake you up!"
" YEAH, so WAKE UPPPP!!!"

All three of the kids yelled simultaneously, with Ipin and Fuuta maneuvering to each side of the boy and Lambo jumping onto Tsuna's stomach, making him gasp.

"Ah! Okay, I'm up! please stop jumping on my stomach, Lambo!'' Tsuna got up, shifting Lambo to the side next to Ipin and turning his legs off the bed. "and good morning to all of you. can you tell Mama I'll be down soon?"

The kids left as abruptly as they entered with three nods, jumping off the bed and running down to the kitchen. Tsuna sat immobile for a minute, getting his bearings before stretching, yawning, and getting up to get ready. Finally, he looked around and noticed Reborn wasn't in the room and shrugged, thinking he must already be downstairs.
'good thing... I'd rather be woken up by the kids yelling and jumping than a hammer....' he thought with a shudder. He quickly got ready and made his way downstairs, going so fast he tripped down the second to last step and just about faceplanted into the floor (which would typically be how it went with his clumsy luck) but was able to catch himself just in time.
'hieEE I thought I was past this falling down the stairs every morning thing!' he internally screamed, picking himself up.
 

"Good Morning, Tsu-Kun! Breakfast is almost ready! I had the kids wake you up so you won't be late on the first day of your new school!" Nana chirped, pausing briefly in her cooking to hug him and kiss his forehead. Tsuna hugged back with a mumbled good morning, then sat down at the table and looked around to see who was there already. Lambo, I-Pin, Futa....but no Reborn? Huh. That was strange. Usually, he is here drinking coffee? He shrugged and started to eat his breakfast, not too worried about it. Reborn does his own thing, after all.

'at least it's not as chaotic this morning as usual. how nice!' He smiled to himself, taking a bite of food.

He came to regret that thought immediately, as three things happened simultaneously. One, a shiver went up to his spine. Two, a sense of Deja Vu went through his mind. Three, the front door busted open. He jumped out of his skin at the sudden loud noise and turned towards the front door.

Oh. Here came the chaos.....

"TENTH!!! Something is wrong!!" yelled Gokudera running to the kitchen with Yamamoto on his heels. He stopped abruptly and inhaled before saying in a much calmer tone, "Good Morning Tenth and Mama! And I guess you kids, too."
 

"Good morning Tsuna, mama, and chibis!" Yamamoto laughed his greeting out from right behind Gokudera.
 

"AH, Hayato! Takeshi! Good morning! What do you mean something is wrong???" Tsuna yelped in alarm jumping up from the table.
 

"Everything is wrong!!" Gokudera yelled, gripping his hair and pulling it.
 

"We saw lots of people in funny costumes outside! There must be some cosplay festival happening!" Yamamoto said in between bites of his food, still with his cheery voice. Oh...when did he sit down and get food??

"You idiot, those weren't normal costumes!! Didn't you see how those people were using some powers?!! And why are you eating! we have to figure out what's happening!!!" Gokudera angrily shouted at Yamamoto before quickly turning back to Tsuna and saying in a much calmer voice. "Tenth. Something strange has happened. We got invaded by UMAS!" 

Tsuna raised his eyebrows in concern and was about to respond when he heard (and felt) his phone starting to ring off the hook with calls and text messages.
 

"hieeee, what the heck! What's happening? Why is everyone trying to get a hold of me?? And what do you mean, UMAs?!" he looked back and forth between his phone and Gokudera, deciding one thing at a time and focusing back on the first issue.
 

"Look!!" he ran to the tv and turned it on to the news channel, which was following a big fight between what looked like a monster and a GIANT lady. They watched as the giant lady grabbed the monster restraining it, and another person that looked like a.....bunny(???) leaped to kick the beast in the head, knocking him out and the gathered audience cheering.
 

"oh! Mt Lady and Mirko are such amazing Heros! I love them!" Nana squealed from behind them on the edge of the kitchen, watching the fight with dreamy eyes. The kids ran past them, screaming about wanting to see the Heros, and jumped onto the couch.
 

"Oh, that's cool, they must be filming a new tv show! That's probably it, Hayato-kun! No need to worry!" Tsuna said, shrugging it off and going back to get dressed for school. 

Gokudera frowned and shook his head, mumbling, 'something is weird here...' but didn't argue as he followed Tsuna up the stairs.
 

Nana giggled, watching them go, "silly Tsukun, what is he talking about it being a tv show?" she shrugged and looked towards Yamamoto, who was still watching the news report. He raised an eyebrow at Nana's comment but didn't say anything.
 

"Oh! Speaking of Heros! You three will be late if you don't get into your uniforms and leave in the next five minutes! So hurry, hurry! Takeshi-Kun, can you tell Hayato-kun that his uniform is in the other room with yours?" Nana exclaimed while leading Yamamoto to the stairs to hurry him up. Yamamoto rose an eyebrow in confusion again but took it in stride, nodding and heading up the stairs.
When he got to Tsuna's room, he relayed the message, but the other boys were already staring at the uniform in confusion. They expected to see the cream-colored blazer uniform for Namimori high in the closet. Instead, They found a Grey blazer with green decals, a white button-up, green pants, and a red tie.
 

"oh? did they change the uniform for this year?" Yamamoto asked as he left to go put his uniform on. "that's cool. I like it!"
 

"I could have sworn I saw a different uniform in my closet yesterday.....and why were your uniforms delivered here???" Tsuna frowned and rechecked his closet but did not see anything different, just another set of this same new uniform. Gokudera, next to him, checked too but saw nothing. 

"What the fuck is going on right now???" Gokudera grumbled. 

They jumped when they heard Nana shout up the stairs to hurry, and they all quickly got dressed and ran back down the stairs.
 

"Good Luck on your first day at UA Hero Academy! Your boxes should be there already! Don't forget to call me whenever you can during the week and every weekend!" she exclaimed, handing each their backpack and shooing the three teens out the door with another tight hug and kiss each. The boys hugged back automatically and waved once they reached the gate. They walked off and down the road in a daze as everything caught up to them.

Wait. What?

Gokudera stopped abruptly, causing Tsuna to crash into the back of him. "I'm sorry, Tenth! I was just caught up with what Mama said! Yuuei Hero academy???" What the heck is that?! Tenth, what is happening??"
 

Tsuna stepped back and rubbed his nose, waving it off. "It's okay! But... I-I-I don't know! Let me check my messages and see if the same weird things are happing to the others!" Tsuna stuttered out while pulling out his phone.

30 Missed calls
100 new text messages

Oh god, he forgot about his phone!! He yelped and opened the message of the people more likely to hunt down and kill him if he continued not answering.

>Kyouya <3: Tsunayoshi. What is going on? You better answer me quickly, or I will go over there and Bite you to Death.

   <Little Animal: aH Kyoya-kun! I'm sorry! I don't know what's going on so, please don't bite me to death!

   >Kyouya <3: You better get to this school quickly before I bite everyone to Death.

  < Little Animal: HIEE, please don't!! Are you at this UA Hero Academy too??"

   >Kyouya <3: Yes. Get here now.

   <Little Animal: okay! I'm on the way!!
 

The boys had begun walking again, but after this little convo, Tsuna began to run. The other two followed behind, with Gokudera yelling something about Hibari being rude and Yamamoto raving about how fun this all was. (How is he always so calm about everything???)

   >Reborn: Dame-Tsuna. You better be on your way here. We need to have an emergency Guardian meeting.

   <Tsuna: the UA school, I'm guessing? Yes, yes, I am on the way! Please let others know!


Reborn didn't answer back, and he didn't know if he should feel more worried about that or just relieved......

   >Enma <3: Tsukkun.....Are you being told to come to this UA place too??

  < Tsukkun <3: Enma-kun! You too?! Do you know what's going on??? My phone is blowing up!

   >Enma <3: no...I'm confused, too, as are my guardians....we are all on the way to this UA place. Hopefully, we can get some answers there.

  < Tsukkun <3: I hope so too! See you in a little bit! Try to keep Kyouya calm if you get there before me!

   >Enma <3: okay <3

   <Tsukkun <3:  <3
 

Tsuna made the executive decision to answer all his guardians in the group chat with an 'I don't know, but I'll be there soon' message. Then he messaged Shoichi to see what he knew. By the time he finished answering all his calls and texts, the three boys were standing at the front of the UA gate.
 

Tsuna didn't know what to expect, but this chaotic situation wasn't a new thing. He just wanted to know what the heck was going on and hoped it wouldn't end up being a disaster.

 * * *

Chapter 2: The Other Side

Summary:

Edited 4/9/25

 ***

Before Tsuna's morning surprise attack by little gremlins, Izuku was already sitting in the kitchen, eating breakfast after being up early for his morning exercises. A couple of others were in the kitchen with him in various states of awareness. Todoroki sits beside him with his head on the table, half asleep, messy hair sticking out everywhere. Uraraka is sipping coffee with blurry eyes across from them, also with a head of unkempt hair. Tsuyu was eating next to her, more aware than the others. Iida was bright-eyed and bushy-tailed on the other side of Izuku, already perfectly ready for the day. Bakugou was at the stove cooking, and Kirishima was leaning on the counter, chatting enthusiastically. Mina and Hagakure were walking in, stretching and yawning, and Hagakure looked like she was probably brushing her hair. Yaoyorozu had the same bright-eyed look as Iida and led a half-awake Jirou to the kitchen table. Everyone else trickled in, and slowly the place was getting lively and noisy. Finally, after a little while, the class began to get ready to leave to walk to the school building.

"Hey. Uh, did we get some new transfer students or something?" Tokoyami asked as he walked into the room where most of the class had gathered. He stopped for a second at the edge of the room, looking at his classmates.  He didn't direct his question towards anyone in particular, so only a few people looked up to acknowledge him. Yaoyorzu and Jirou were the closest to him, so he looked to them for an answer. Surely Yaoyoruzu would know as the vice president.

Yaoyoruzu looked at him with a confused look. She tilted her head as she thought for a second, then shook her head. "Um...no? I don't believe so. So why do you ask?"

"Dark shadow noticed little drones bringing up boxes to the empty dorm rooms last night and let me know," He replied, gesturing to the shadow above his shoulder. "So this morning, I went to check one of the rooms and noticed they were filled with boxes, not unlike how it was when we first moved in."

Yaoyorozu frowned in confusion and looked at Jirou next to her. Jirou shrugged; she didn't listen to everything all the time. That would be a Mistake. Ochaco and Tsuyu, who were nearby, paused their conversations to listen in. 

"Oh? That's strange. I didn't hear about any new students. Have you heard anything, Iida?" She looked over at Iida, who had been about to answer. He shook his head and got up to walk closer. Behind him, Izuku and Shoto got up to follow him curious about what they were talking about. 

"No. I have not! Perhaps Aizawa sensei will inform us today in class?" He answered with a confused look on his face, too. He then frowned, thinking that surely the staff would have given them a warning of some sort. 

"oooh, transfer students?! I didn't think we got those! How many rooms did you check?" Mina piped up from the couch she had been lounging on with Sero and Kaminari. (They have plenty of tiiime, no need to rush to school!) She had been eavesdropping on all the convos near her and perked up when she heard the words, 'new students'. Her loud question gathered the attention of the rest of her classmates, which put a pause in all conversations.

" I only checked the ones on the second floor. All four rooms contain moving boxes." Tokoyami replied, Dark shadow next to him nodding along.

The room proceeded to explode in volume as everyone was talking at the same time.

"Holy shit! Four new people??"

"Do you think any of the other empty rooms are too!??"

"I don't know, but we should check!"

"Ohh, I hope they are cute!"

"I wonder what their quirks are!!"

"Ugh, not more extras."

"This is a weird time to transfer?? And so many at once?"

"Oh. oh no. this sounds like some anime or manga type of shit where the main character transfers in, and then all the crazy stuff begins!"

"That's stupid. This isn't some anime world, idiot."

"Hey! It -

The doors abruptly slammed open, cutting off the rest of that statement and making a few people jump as they startled and, in walking Eraserhead, Present Mic, and Midnight. All conversations halted as the students were made alert and ready.

Eraserhead let out a huge sigh and scrubbed his face, addressing the room. (Why does everything involve him and his problem children? Can't they have one typical semester without something happening?)

"Class is delayed today due to unforeseen circumstances, so for now stay in the dorms until further notice." And before the class had the chance to reply, he continued, "No, I will not tell you what's going on right now, other than it is not a villain attack. Yes, you need to stay in this building. Yes, we are aware of the moving boxes in the empty dorm rooms. I know you all have questions, but we do not currently have any answers for you." 

The room again exploded in volume as all the students tried to ask questions anyways, and the class all clamored to the front of the pro-hero teachers. Iida immediately went into action to control everyone and organize a formal way to ask questions. (He was ignored)

 Aizawa sighed again. Ugh, he expected things to go exactly like this. He rubbed his forehead in the place where a headache was creeping upon him. Next to him, Present Mic and Midnight laughed and tried to answer as many curious students' questions as possible.

 This is going to be a long day, and it's barely even begun. 

***

Notes:

Ahhhahhh Sorry I uh couldn't quite get the words out....but now I'm kinda sick....and at home... so I can write more! I'm determined to get/keep this story going!

Notes:

Suggestions and critiques are very welcome! 🙌 Rude and unnecessary hate is not. ✌