User:Young Mako/Sandbox

Prologue
Several years ago, there was an attack on a Casino in California USA. Two villains, one blue and beastly and the other clad in red, escape from the scene and stir up a public panic. The police, Elec Plant, and Cow Lady and try to apprehend the criminals but they escape using their beastly abilities. The chaos threatens a family trapped in their car but a young unknown hero sends the villainous duo flying with a powerful punch.

The villains demand to know who they're fighting but the young man simply replies he's a hero from Japan. The villains attack with a missile barrage that the hero easily dismisses. The two criminals quickly flee the scene and David uses his advanced car to pick up his friend. Together, David Shield and Toshinori Yagi pursue the villains through town.

The red villain uses his missile Quirk only for David Shield's F-Unit car to counter with a shield of bubbles that trap the explosions. David reminds Toshinori they're going to be late for a lecture. Toshinori kicks it into high gear and chases the criminals up the side of a building. The blast from more missiles burns Toshinori's clothes away, revealing the hero costume beneath. All Might makes his debut in America in fashion by defeating the villains with California Smash!

Act One
All Might awakens from his dream of the past to his young protege calling his name. Izuku Midoriya wakes his sensei so they can look at I-Island together from the sky as their plane prepares to land there. Izuku is thankful he gets to visit I-Island at the beginning of the summer break. All Might is glad he invited young Izuku but the latter isn't so sure he belongs. He believes plus-1's should be reserved for family but All Might reassures him they are connected by something thicker than blood.

The plane starts its landing procedure and All Might shifts into his muscular form. He must maintain this form the entire time to keep his weakness a secret. All Might makes sure Izuku brought his hero costume along and they both exit the plane. As they pass through immigration, All Might asks Izuku what he knows about the island. Izuku starts muttering about I-Island's origin as a place for researchers to come together to study Quirks and create support items.

The I-Expo preopening is starting, and those with an invitation can gain access to an abundant showcase of incredible technology. People on I-Island can use their Quirks freely and many of the expo attractions use Quirks. While Izuku is geeking out over the beautiful view of the island, All Might gets swarmed by a crowd of adoring fans. The incident nearly makes All Might late for a reunion with an old friend.

All Might asks Izuku to meet his old friend but reminds him not to spill the details about One For All. Melissa Shield uses a pogo stick to approach "Uncle Might" before greeting him with a hug. All Might is happy to see Melissa has grown up into a young woman. Now 17, Melissa says she invited All Might to the expo to surprise her father as a gift because he's finishing up an important research project. All Might introduces Melissa to Izuku and she learns that he is Uncle Might's student. Melissa starts asking Izuku about his Quirk and checks out his costume, all while making Izuku uncomfortable. She also notices the scars on Izuku's hand but All Might reminds her about their agenda.

Meanwhile, a mysterious group of men overlooks the airport lobby. Their leader talks to someone on the phone and confirms they infiltrated the expo and that "the goods" will arrive later in the day. In David's lab, he and Sam talk about how hard Melissa has been working on her own research. Melissa interrupts to reunite David with his longtime friend All Might.

David and All Might are very happy to be reunited. All Might introduces Izuku who immediately recognizes David Shield and geeks out over him being a top scientist in Quirk research. David is also the man responsible for all of All Might's costumes. David wishes to get re-acquainted with All Might alone and asks Melissa to show Izuku around the I-Expo.

The teenagers leave and Melissa asks Izuku what his preferred name is. He replies Deku and Melissa calls it a strange nickname. Meanwhile, All Might reverts back to his weak form and thanks David for getting everyone out of the room. David is surprised at Toshinori's state even after getting notified of what happened via email.

Izuku and Melissa notice Godzillo among other heroes that were invited to the expo. Melissa also asks if Izuku is attending the industry party later that day. Izuku believes this is why All Might made him pack formal clothes. Melissa brings Izuku to the pavilion where together they geek out over flashy support items developed for the expo. Izuku asks Melissa about how much she respects her dad and she replies that she wants to be just like him. Melissa is a third year at the I-Island Academy where students go to become scientists. She and Deku share the same goal of working hard to become like who they look up to.

Ochaco Uraraka suddenly interrupts Izuku's playdate alongside Momo Yaoyorozu and Kyoka Jiro. Izuku's classmates believe he's on a date but he tries to calm the situation down by explaining what happened. Melissa starts talking about All Might but Izuku stops her to remind her not to say anything. The five of them go to the cafe to have tea together where everyone gets better acquainted. Denki Kaminari and Minoru Mineta surprise their classmates by working as extra staff at the cafe.

Tenya Iida abruptly joins the party by running in to remind the boys to work harder. The Iida Hero Family received invitations to the expo but Tenya was the only one who could attend. Momo got invited because her family has stock in some of the I-Expo's sponsors. She got to bring Kyoka and Ochaco along with two extra invites. The other girls lost rock paper scissors and can't attend the I-Expo until it's open to the public. Melissa promises to show everyone around once the expo is fully open.

Izuku notices an explosion nearby and heads toward it. He arrives at the "Villain Attack" attraction while Eijiro Kirishima clears it in thirty-three seconds for eighth place. Next up, Katsuki Bakugo clears the event in only fifteen seconds and jumps into first place. Eijiro notices his Izuku and his other peers watching from the stands. Katsuki is annoyed by Izuku's presence and makes a scene. Eijiro tells everyone that Katsuki got invited since he won the U.A. Sports Festival and he just tagged along.

Izuku takes on the Villain Attack attraction next and manages to score second place with a time if sixteen seconds. Melissa notices that Izuku's destructive power is very similar to All Might's. Ochaco and Tenya praise Izuku for his performance, further annoying Katsuki. Suddenly, Shoto Todoroki clears the event in fourteen seconds and steals first place out of nowhere using his ice. Irritated, Katsuki flies to Shoto and gets in his face about why he's there. Shoto reveals that he was invited to represent Endeavor. Tenya puts a stop to their feud while Melissa says that all U.A. students are incredible.

Concurrently, the mysterious man from earlier receives the "goods" and learns All Might is on the island. David runs tests of Toshinori's broken body and learns that his Quirk levels are astronomically low. He asks Toshinori about it but he gives him a vague response. David worries that Japan's low crime rate of 6% will rise with the fall of the symbol of peace. All Might reassures him that the symbol of peace is still alive.

Melissa and the others regroup with Denki and Minoru. Melissa prepared invitations to the party of them and moves them both to tears. Tenya reminds everyone to meet up at the party at 6:30pm. Everyone disperses but Melissa asks Izuku to join her at her lab. Katsuki refuses to go to the party because he's unprepared but luckily Eijiro brought clothes for him. All Might shifts into his muscle form and leaves David's lab, promising to see him later at the party.

David recalls the first time he ever met Toshinori. There was an accident at his school where an experiment caused an explosion that set fire to the building. Toshinori saved all the people trapped inside from the blaze. David greets Toshinori and learns he's trying to become a hero. David creates a costume for All Might to use as a hero. From that point on, they worked together to suppress villains and worked as heroes during All Might's young age. All Might shared his dream of acting as a symbol of peace for the world with David.

Act Two
A group of masked villains receives "the goods", which are equipment and weaponry they use to restrain all the parties security guards. The main villain dons his mask and moves out with his team. On the campus of I-Island Academy, Melissa shows Izuku to her lab. He notices all her awards and commends her. Melissa claims her grades were slipping but she still studies hard to become a hero. Izuku asks if Melissa wants to become a Pro and she reveals that she can't because she's Quirkless. This shocks Izuku because they were both born without Quirks. Melissa is okay with being Quirkless because she can still be a hero that supports others like her father.

Melissa gives Izuku an old support item she invented that was inspired All Might. She calls it Full Gauntlet and she equips it to Izuku's injured hand. Izuku activates the item and it takes shape as a gauntlet around his arm. Melissa could tell from Izuku's scars and his performance at the attraction earlier that his Quirk was too much for his body to handle. She gives it to Izuku because it can take the full power of All Might's punches three times before it breaks. In other words, Full Gauntlet will allow Izuku to use 100% of his power for three smashes. Melissa entrusts this item to Izuku and asks him to become a great hero that can protect people.

Tenya calls Izuku to scold him for missing their scheduled meeting time. Izuku rushes to the central tower where he meets with Tenya, Shoto, Denki, and Minoru. All of the ladies walk in dressed in their formal attire, much to the pleasure of Minoru and Denki. The party is being held in the reception hall on the second floor of the tower. There, the representatives of the expo ask the No. 1 hero to speak for the crowd. Tenya is unable to contact Katsuki and Eijiro because they left their phones and have gotten lost trying to find the party.

All Might's speech is abruptly interrupted when the I-Island Security System sets off an alarm across the entire island. Hanta and Rikido notice it from the business district while Mina, Tsuyu, & Toru watch from their hotel room. The security system threatens everyone with a curfew, forcing Fumikage and Mezo to rush indoors. The system also locks the central tower from the outside.

Wolfram and his masked legion of criminals barge into the party armed with guns. They threaten to use the security bots to hold every one on the island hostage. All of the Pro Heroes including All Might get restrained by powerful bonds shot from the ground. David warns All Might to comply with the villains and swears to find a way to save everyone.

Meanwhile, the U.A. students are also at the mercy of the security system. Their cell phones have no signal and their access to the elevators have been denied. Izuku tells everyone that All Might is at the party so that's where they need to go. At the hostage situation, Wolfram promises to release everyone in time. He silences a mouthy hero and receives orders to take in a researcher. He attempts to take in Samuel Abraham but David saves his assistant. Both of them are taken in as All Might watches in bondage.

All Might notices Izuku flashing light at him from the third floor. Kyoka uses her Quirk to listen to All Might as he explains the situation. Tenya suggests that the students escape since they can't legally fight villains. However, Melissa reveals that I-Island's security is on par with Tartarus's. Shoto and Kyoka believe that they should try to help while Minoru and Momo believe they can't. Awkward silence is interrupted when Izuku says he wants to save everyone.

Minoru believes Izuku hasn't learned from the U.S.J Incident, but Izuku reveals they can save people without fighting. Melissa believes in him and tells everyone they can reset the security system if they reach the top floor of the tower. Everyone decides to work together to disable the system so that All Might can defeat the villains and turn the tables. Izuku tries to tell Melissa to stay behind because she's Quirkless. Melissa refuses because she's the only one who can disable to the security system. She wants to help save everyone just as much as Izuku.

Izuku relays the message to All Might. He mostly disapproves, but he agrees that heroes must act in this kind of situation. All Might puts his faith in his students and remains constricted on stage. In the control room, the villains threaten David and escort him to another area. Meanwhile, the U.A. students scale over fifty floors until they run into a shutter cutting them off from the 80th floor. Minoru makes a poor decision and opens the door to the main section of the floor. The security system notifies the villains and Wolfram sends his men to neutralize them.

Shutter doors close in on the students from both ends of a corridor. Shoto uses his ice to keep one of the doors open long enough for Tenya to open a path to the Plant Factory. Kyoka stops everyone when she notices the elevator on the other side of the floor is going up. They decide to hide and hope the villains don't notice them when they exit the elevator. Two villains do notice some kids, but they turn out to be Katsuki and Eijiro.

Eijiro tries to explain that they got lost but the villains get aggressive. Shoto acts quickly and uses an ice shield to protect Eijiro from one of the villain's Quirks. He also creates an ice pillar to raise Izuku and the others to the next floor. Shoto explains the situation to Katsuki and Eijiro before they engage the villains in battle.

Izuku's group doesn't see a way forward but he notices a small door on a nearby roof panel. Melissa explains it leads to the maintenance room but can only be accessed from the inside. Momo creates a small bomb to open the door and tells everyone they can access still use it to access the outside wall. The group volunteers Mineta for the job and Denki encourages him with the promise of a harem waiting at the end of this incident. Mineta uses his Quirk to scale the outside of the tower and completes his task by opening the way for his friends.

In the control room, the villains are irritated by the student's resistance. They demand the invaders in the field deal with the students. The villains fighting Shoto and Katsuki prove to have strong Quirks. One is a beast shifting Quirk while the other allows him to hollow out space. Katsuki defeats the beast with his Howitzer Impact move. He gets his sweat on the other villain, giving Shoto the opening to detonate it with his fire. After defeating the villains, Shoto and Katsuki check up on Eijiro. He's fine, just stuck in place by his own Quirk. They're interrupted when a mass of security bots floot the planty factory.

Wolfram orders his subordinates in the control room to use the security bots to apprehend the students. Izuku's group passes the 100th floor and Denki notes how the shutters have opened for them. Ochaco deduces that the villains are trying to lead them somewhere. They reach the 130th floor and are greeted by dozens of security bots. Momo prepares a sheet of isolation for the group and they execute Plan A. Tenya uses his speed to throw Denki at the bots where the electric hero uses Indiscriminate Discharge 1,300,000 volts. The robots are able to defend against his Quirk so Denki turns up the voltage to two million. His power quickly fades out and Denki shorts out his brain.

Tenya orders his peers to switch to Plan B. Momo creates smoke bombs that interfere with the robot's systems. Everyone throws them at the robots while Monru uses his balls to trap them. Izuku and Tenya use their strength to break through the blockade. Using Full Gauntlet, Izuku pushes the bots back using 30% of One For All.

Wolfram's subordinates notify him that the students got away and he deduces one of them has a sensory Quirk. The students make it to the server room on the 30th floor where they are ambushed by even more security drones. Melissa warns everyone they can't afford to damage the server room by fighting. Tenya and Momo offer to hold off the drones while Izuku takes Melissa on another route. Ochaco joins them and leaves everyone else to fight. Tenya takes on the bots using Recipro Burst while Momo creates a cannon that fires adhesive material.

Izuku, Ochaco, and Melissa continue ahead as their friends fight. The bots manage to outlast Tenya's time limit and Momo and Minoru's bodies have reached their limit as well. The robots use restraining bonds to capture the kids. Izuku's trio reaches the wind power generation system where they hope to avoid getting ambushed again. Melissa asks Ochaco to use her Quirk to float she and Deku toward an emergency exit at the top of the tower.

Ochaco lifts Izuku and Melissa toward the exit, but this leaves her exposed to another robot ambush. Melissa tells Ochaco to release her Quirk but she refuses. Just before the robots get to her, Katsuki makes an explosive entrance and saves her. Shoto and Eijiro join the battle and repel the bots using their Quirks. Wind threatens to carry Izuku and Melissa away but Shoto acts quickly. Katsuki moves one of the wind turbines toward Izuku and Shoto uses his flames to push hot wind in their direction, setting them back on course.

Izuku takes a moment to thank Shoto for using his fire and then recalls Melissa's explanation for Full Gauntlet. He uses a full power detroit smash to break his way into the top floor of the tower. Ochaco releases her Quirk once their inside and Wolfram learns of their advancement. He orders Swordkil to deal with the intrusion. All Might struggles to maintain his form but he continues to believe in his students.