This story is for Artemis_11 on Archive Of Our Own for Cosmonauts Holiday Gift Exchange 2022 on AO3.

I would like to extend my sincerest apologies for submitting this story almost a year later than expected. It was an oversight on my part, and I deeply regret any inconvenience or disappointment it may have caused. I must also confess that I have never watched nor read "Boku no Hero Academia" or "Haikyuu!" in their entirety. My knowledge is limited to bits and pieces I've found on YouTube and through conversations with friends. Therefore, I had to rely on the assistance and insights of those more familiar with these series to create this crossover story.

Your idea of "Could be a crossover could be them singing their heart out to random songs and getting caught" sparked my imagination and served as a starting point for the narrative development. I understand that my lack of firsthand experience may have affected the authenticity and depth of the story; mostly everyone is out of character and some things that I added are not canon. So, I apologize for any inaccuracies or inconsistencies that this caused. I did not intend to misrepresent the original works' characters or essence. Once again, I sincerely apologize for any disappointment or dissatisfaction caused by the delay and my limited familiarity with the source material, Artemis_11.


The bright sun illuminated the bustling streets as Karasuno High School's volleyball team and U.A. High's Class 1-A explored the city together during a school trip. Excitement filled the air as they stumbled upon a vibrant park adorned with colorful decorations.

Hinata's eyes sparkled with curiosity. "Hey, guys, what's happening over there?" he pointed towards a stage where a singing competition was about to begin.

Kageyama glanced at the stage and raised an eyebrow. "A singing competition? Are we allowed to participate?"

The U.A. students exchanged glances, intrigued by the idea. Midoriya, ever the optimist, chimed in, "Why not? It could be fun to showcase our singing skills!"

Bakugo scoffed. "Singing? That's a waste of time. But if Deku wants to embarrass himself, I'll gladly watch."

Undeterred by Bakugo's comment, the Karasuno and U.A. students made their way toward the stage. The competition was about to start, and they joined the crowd, ready to witness the performances.

The emcee took the stage, introducing the rules of the competition and the first participant. Hinata nudged Kageyama excitedly. "Kageyama, we should go for it!"

Kageyama smirked, his competitive spirit ignited. "Fine, but don't drag us down, Hinata."

As the first singer finished, the emcee scanned the crowd. "Who's up next? Anyone from the audience?"

Without hesitation, Hinata raised his hand, almost jumping up and down. "Me! I want to give it a shot!"

The emcee chuckled and gestured for Hinata to join him on stage. "Well then, we have a brave volunteer! Let's see what you've got!"

Hinata stood on the stage, a microphone in hand, as the music began. The energetic beats of a rock song filled the air. With contagious enthusiasm, he started singing, his voice surprisingly harmonizing with the music.

Hinata's performance was electrifying, his wild energy captivating the audience. The Karasuno team cheered him on, clapping and singing along from their spots. Kageyama couldn't help but crack a small smile, impressed by Hinata's ability to draw people in.

As Hinata finished his performance, the crowd erupted into applause, thoroughly entertained by the unexpected display of talent. The emcee grinned. "Well done, young man! Who's next?"

Inspired by Hinata's courageous act, the U.A. students decided it was their turn to take the stage. Midoriya stepped forward, a determined expression on his face. "I'll go next!"

The emcee nodded approvingly. "Very well! Show us what you've got!"

The music shifted to a melodic pop-rock tune, and Midoriya began his performance, pouring his heart into the song. His voice, filled with determination and vulnerability, resonated with the audience. Bakugo, who had been watching from the crowd, couldn't help but feel a grudging respect for his friend's passion and talent.

Encouraged by Midoriya's performance, other U.A. students joined in, showcasing their unique singing styles. Uraraka, with her gentle voice, sang a heartfelt ballad, while Kirishima's powerful vocals brought a touch of rock and roll to the stage.

Meanwhile, Hinata, still brimming with energy, pulled Kageyama onto the stage, insisting that they perform a duet. Kageyama hesitated for a moment but gave in, unable to resist Hinata's infectious enthusiasm.

Together, their voices blended seamlessly, complementing each other in a way that surprised even themselves. As they sang, their rivalry on the volleyball court seemed to fade away, replaced by a newfound harmony.

The audience watched in awe, swept up in the exhilaration of the moment. The park reverberated with cheers and applause, encouraging the students to give their best.

Just as the performance reached its crescendo, the unexpected happened. The event organizers, who had been unaware of the impromptu performances, mistook the enthusiastic singing as an attempt to sabotage the competition. They hurriedly approached the stage, their stern expressions reflecting their suspicions.

Hinata, Kageyama, Midoriya, and Bakugo exchanged worried glances, their hearts pounding. The emcee stepped forward, addressing the perplexed students. "What's going on here? This isn't a part of the competition!"

Hinata's voice quivered slightly. "We didn't mean any harm, sir. We were just caught up in the moment."

The organizer crossed his arms, skeptical. "Caught up in the moment, huh? Explain yourselves."

Deku took a step forward, mustering his courage. "We saw the competition and got carried away with the music. We didn't intend to disrupt anything. We just wanted to have fun."

Bakugo couldn't resist adding his sharp wit. "Yeah, we're just a bunch of idiots who can't resist showing off."

The organizers exchanged glances, their stern expressions softening. The emcee sighed, realizing the misunderstanding. "Well, I suppose the enthusiasm was contagious. But remember, rules are rules. You can't just join a competition without signing up."

As the tension eased, the organizer decided to give the students a chance to make amends. "Since you've caused quite a stir, why don't you prove your talent and perform as a group? Show us what you've got."

Hinata's eyes lit up, the mischievous glint returning. "All of us together? That sounds awesome!"

Kageyama, still slightly skeptical, crossed his arms. "Fine, but we'll need a plan. We can't just wing it."

The U.A. students exchanged determined looks, eager to find a way to turn this situation around. Midoriya stepped forward, his voice filled with determination. "We need to show them that our singing wasn't just a fluke. Let's create a performance that combines our abilities and surprises everyone."

Bakugo smirked, his competitive spirit ignited. "I like that idea. Let's blow them away!"

With newfound purpose, the students gathered in a circle, brainstorming ideas for their great collaborative performance. They realized that their singing and superhuman abilities could create a spectacle that would capture everyone's attention.

As they shared their ideas and talents, the park came alive with their energy and excitement. The group dynamic grew stronger as they worked together, combining their unique skills to create a performance that would be remembered.

The time of the performance arrived, and the park was abuzz with anticipation. The crowd had grown larger, intrigued by the upcoming spectacle. The students from Karasuno and U.A. High stood side by side, ready to showcase their talents and clear their names.

The music began, a lively melody pulsating through the air. Hinata took the lead, his voice rising with infectious energy. Kageyama joined in, his voice blending seamlessly with Hinata's as they executed their practiced moves.

In the background, Midoriya and Bakugo displayed their quirks, creating dazzling effects that enhanced the performance. Midoriya's One For All empowered him with bursts of energy, while Bakugo's explosions added a literal spark to the show.

Uraraka, Kirishima, and the rest of the group added their voices to the mix, harmonizing with the lead singers and showcasing their styles. The park came alive with its synchronized movements, vibrant costumes, and awe-inspiring abilities.

The audience watched in awe, their eyes wide with amazement. The organizers, who had initially doubted their intentions, were now captivated by the display before them. The misfit group had transformed into a force of talent, working together to create something truly extraordinary.

As the performance reached its climax, the crowd erupted into thunderous applause. The organizers, their skepticism washed away, exchanged impressed glances. The emcee, unable to contain his excitement, took the microphone and addressed the students. "What a performance! You've certainly proved us wrong!"

Hinata, Kageyama, Midoriya, and Bakugo, breathless but elated, exchanged triumphant smiles. They had not only cleared their names but had also won the hearts of the audience and the competition judges.

The students from Karasuno and U.A. High returned to the stage, basking in applause and adoration. The park was filled with cheers, their performance leaving a lasting impact on everyone present.

In the aftermath, as the sun began to set, the students bid each other farewell. The misadventure they had shared had brought them closer, forging new friendships across the two worlds. They knew they would always treasure the memories of this unexpected crossover.

Inspired by their collaboration, some students decided to explore new avenues of expression and pursue their passion for music alongside their existing dreams. The bond they had formed would continue to transcend the boundaries of their respective worlds.

After the triumph of their performance, the Karasuno and U.A. students decided to let loose and enjoy the rest of their trip. They found themselves at a local karaoke bar, excited to sing their hearts out once again.

As the night progressed, the atmosphere became increasingly jovial. The students took turns selecting songs, each trying to outdo the others with their song choices and performances. The room echoed with laughter and off-key singing.

Hinata, in his usual energetic fashion, leaped onto a table and belted out a rock anthem, much to the surprise and amusement of his friends. Kageyama, not one to back down from a challenge, joined him, showcasing his surprisingly impressive vocal range.

Meanwhile, Midoriya attempted a passionate rendition of a power ballad, complete with dramatic gestures and exaggerated emotions. Bakugo, ever the prankster, decided to turn the tables by selecting a catchy pop song and performing an impromptu dance routine, much to everyone's amusement.

The night continued with each student taking turns showcasing their singing abilities, and the karaoke bar echoed with laughter, cheers, the occasional cries of "Please stop!" and a whole lot of showing off.

As the night progressed, the excitement reached its peak, and the crowded room buzzed with electric energy. Amidst the cheerful chaos, Midoriya Izuku found himself sitting next to Uraraka Ochako. They had been friends for a while, but tonight, there was something different in the air.

Their eyes met, and a warm smile spread across Midoriya's face. "You have an incredible voice, Uraraka. I never knew you could sing like that."

Uraraka blushed, her cheeks turning a shade of pink. "Oh, stop it! I was just having fun. But thank you, Midoriya. You were amazing too!"

A playful glimmer sparkled in Midoriya's eyes. "Well, what can I say? I have many hidden talents." He chuckled, causing Uraraka to giggle in response.

As they sat together, enjoying each other's company, their friends couldn't help but notice the budding romance between them. Bakugo Katsuki, who had been watching from a distance, couldn't resist making a snide remark. "Well, well, look at the lovebirds. Can't keep your eyes off each other, huh?"

Midoriya's face turned a shade of red, and he quickly retorted, "N-No, it's not like that! We're just friends!"

Uraraka joined in, her voice laced with a playful tone. "Yeah, just friends who happen to enjoy each other's company."

The teasing continued, with their friends playfully nudging and winking at them, well aware of the romantic tension simmering beneath the surface.

Despite their protests, both Midoriya and Uraraka couldn't deny the feelings that had been growing between them. As they shared inside jokes, laughed, and supported each other, there was an undeniable connection that went beyond friendship.

Amid the chaos, a slow song began playing. Couples took to the dance floor, swaying to the romantic melody. Midoriya turned to Uraraka, his voice softening. "Would you like to dance, Uraraka?"

Uraraka's heart fluttered, and she smiled, a hint of blush dusting her cheeks. "I'd love to, Midoriya."

They joined the other couples on the dance floor, their bodies moving together in perfect harmony. Midoriya's hand rested gently on Uraraka's waist, while Uraraka's hand found its place on Midoriya's shoulder. The world around them seemed to fade away as they got lost in the music and the warmth of each other's presence.

As they danced, their gazes met, and the unspoken words between them became louder than ever. They shared a deep understanding and a connection that surpassed words—a bond born from shared dreams, admiration, and unspoken affection.

Their friends watched from afar, smiles gracing their faces as they witnessed the blossoming romance. Hinata Shoyo leaned over to Kageyama Tobio, whispering, "Looks like our friends are finally realizing their feelings for each other."

Kageyama grumbled though a small smile tugged at the corner of his lips. "It's about time. They make a good pair."

As the song came to an end, Midoriya and Uraraka remained in each other's arms, their foreheads resting gently against one another. At that moment, the world seemed to stand still, and they knew that their friendship had evolved into something beautiful—a love that had been waiting to bloom.

Their friends cheered and clapped, celebrating the couple's newfound romance. It was a moment filled with joy, love, and the promise of a future where their hearts would sing in perfect harmony.

As their trip drew to a close, the students decided to end it with a grand finale—an epic concert featuring the combined talents of the Karasuno and U.A. students. They secured a venue and invited friends, family, and fans to witness the spectacle.

The concert was a mix of heart-pounding performances, comedic interludes, and surprises. Hinata and Kageyama's duet once again stole the show, their dynamic energy and undeniable chemistry captivating the audience.

Midoriya and Bakugo engaged in a friendly rap battle, showcasing their creative wordplay and wit. The crowd cheered and laughed, thoroughly entertained by the unexpected talents of the aspiring heroes.

But it wasn't just about individual performances. The students joined forces, singing iconic songs and incorporating their quirks and volleyball skills into the choreography. The audience was treated to a unique blend of music, athleticism, and superpowers, creating a spectacle, unlike anything they had ever witnessed.

The concert concluded with a grand finale that brought all the students together on stage. They sang a powerful anthem of friendship and unity, their voices intertwining in perfect harmony. The audience, moved by the genuine camaraderie and talent on display, rose to their feet in a standing ovation.

As the final notes rang out, the students from Karasuno and U.A. High gathered for a group bow, basking in the overwhelming applause and cheers. They knew that this crossover adventure had created memories that would last a lifetime—a tale of singing, mischief, and the unbreakable bonds formed when hearts come together.

And so, the Karasuno and U.A. students bid each other farewell, carrying with them the lessons learned and friendships forged during their time together. As they returned to their respective schools, they carried a newfound appreciation for the power of music, the joy of collaboration, and the strength that lies in embracing unexpected adventures.


Thank you for reading! If you know of any more tags that I should add to make this story easier to find, please leave a comment! This story is posted on Archive Of Our Own and FanFiction under the same name.