I do not own any Naruto, or My Hero Academia characters. This will only be said once.
During the fourth great ninja war, seconds after Naruto and the nine - tails returned from the realm where the nine tailed beasts met, there was a split second where the universe cracked. Because of all the destruction in the Shinobi world, the power wielded all at once lost control. People who had used their chakra during that millisecond were transported through that small crack. The chakra-users were all separately transported into a world of mystery, all separated into different parts.
"Hrmm," a spiky haired Shinobi groaned. The well-known ninja who was known across the great nation as Naruto, the hero of the hidden leaf, laid on the discomfort of a sidewalk. Slowly opening his eyes, Naruto felt a sudden pain in his lower stomach. He sat up, the morning light shining in his eyes. The air was polluted, the sun was powerful, and it was loud. Very loud.
"Hey Kurama, where in the world, are we?" Naruto asked the beast who was living inside him. There was no answer. He looked around. Buildings reached higher than the sky, asphalt roads ran as far as the eye could see, and hordes of people kept coming and going. Not even one of the strangely dressed people even glanced towards Naruto, making him feel like how he did long ago.
"Kurama," Naruto said again. After no response, he started to worry.
"Please, somebody help!" A scream interrupted Naruto's anguish when a man ran out of one of the buildings, dashing with what looked to be some sort of amulet in hand. Naruto instinctively jolted up, not even caring about the fact that he still didn't know where he exactly was.
"Come back, thief!" Another person yelled. The commotion attracted the attention of many civilians, and suddenly a boy with a greenish-blue jumpsuit ran up the sidewalk and chased the man through a nearby ally, shouting things like "Get back here!" Naruto decided that he would help. He thought that if he helped, then maybe someone could help him - tell him where he was.
"Hey kid," Naruto called. 'Wait up!"
A Minute Later
Naruto, with his 5 trillion FTL speed, quickly caught up with the two in less than a second. He appeared behind the kid in the jumpsuit. The kid had green fluffy, hair and defined muscles, even noticeable through the weird costume he wore. Naruto could see the red amulet that the thief had stole in the kid's right hand.
"Oh, so you caught him," Naruto said aloud.
"Huh?" The green haired kid quickly turned around. Naruto noticed his big, green eyes, complimented by his bold freckles. "Who-Who are you?"
"Wow," Naruto thought. "This kid's a pushover." Naruto strolled closer to the kid. They were the same height, but Naruto still glared down at the broccoli-haired kid intensely. The kid was intimidated. "The name's Uzumaki Naruto," Naruto beamed. "But you can call me Naruto."
The boy shakily backed up. "I've never heard of you before. You don't seem like an academy student. Do you have your Provisional Hero's License?"
"Provisional Hero's License," Naruto repeated. What the hell is a provisional Hero's License? Naruto thought to himself. "Agh, never mind that," Naruto focused. "Where's the guy who stole that thing you're holding?"
The kid looked down at the amulet. He then carefully put it in one of the pockets hidden in his suit. "Oh, I guess he got away."
"What do you mean, 'you guess'," Naruto yelled. "We have to catch that the thief!" Before the broccoli kid could even answer, Naruto grabbed his wrist and ran through the alleyway.
"What the," the boy exclaimed when they ended up nearly a mile away – in only a half a second. "H- how did you do that?"
"Hmm?" Naruto questioned. "I just ran." Naruto grabbed the boy's wrist tighter and jumped onto one of the incredibly tall buildings. The boy screamed, reminding Naruto that he wasn't in the world he knew.
"By the way," Naruto began. "Who are you?"
"Oh," The boy exclaimed. He was still shaken up by everything that Naruto had done in the past minute, but the boy was a very polite person. "My name is Midoriya Izuku, but you can call me Deku if you want."
"Deku?" Naruto repeated. "What kind of name is Deku?"
"I don't know, I kind of like it. It's my hero name, but most of my friends call me it." Naruto didn't know what a 'hero name' was, and he didn't think it was good for Deku's so called 'friends' to be calling him a name that meant useless. Naruto didn't really want to go into detail, so he just went along with it. He walked to the opposite side of the building that Deku was on, and the two looked around the bustling streets below the rooftop.
"I think the man got away," Deku yelled across the roof to Naruto.
"Aww man," Naruto complained. He rubbed his head and turned around. He walked towards Deku, who was still closely observing the crowded roads. "I guess I can go after that guy later. Are you going to return that thing he stole?"
"Right!" Deku remembered. He rummaged through his uniform to look for the amulet. "I'm going to turn it into the police force. I know someone there who may be able to find out who this belongs to. But you can come with if you-" Deku paused when he pulled the amulet from his pocket.
"What? What's going on?" Naruto walked up behind him when he noticed Deku's sentence get caught off. Naruto looked over Deku's shoulder to see that the amulet was curled in a ball on the palm of his hand.
"The necklace, it's a different color than it was before." Deku was right. The amulet had a bright red color before, but now it was a vibrant, green color. Deku held it up in front of them so they could see it better.
"Wow, you're right," Naruto agreed. He laid his hand out flat in front of Deku. "Here, let me see it."
"Sure, just make sure to be careful with it, okay?" Deku slowly gave the amulet to Naruto.
"Yeah, yeah. I get it," Naruto reiterated. To Naruto, Deku sounded just like the pink-haired kunoichi who always hassled him. He held out his hand as he remembered how he still didn't know where he was or how to get back to the war. The amulet shimmered in the sunlight, reflecting the unnaturally strong sun. As soon as the amulet contacted Naruto's skin, a harrowing pain spread throughout his body. Naruto saw a bright flash of light, and then collapsed onto the floor of the roof.