A/N: A little bit of world building here, Danzo still saw the Uchiha as a threat and Itachi still killed them, Obito was away on a mission so he wasn't killed. Obito awakened his Mangekyo when Kakashi died and got replacement Sharingan before the Uchiha were massacred, but has not transplanted them yet.
Disclaimer: I don't own Naruto, (I also don't know if I need to keep saying that, but what the hell, why not?)
o-(=--
A man appeared in the middle of the training grounds clutching his right eye. He stood up. Looking around he didn't see anyone at the grounds. Lucky for me, He thought to himself. The luck didn't last long though. "Damn, looks like I put too much energy into that," he chuckled to himself as he fell over, unconscious.
o-(=--
"Mister, hey mister," someone called out to him. Opening his eye Kakashi looked toward the noise to see three kids staring at him. "Are you alright sir?" the girl asked him.
"I'm fine, thanks," he told them.
"Hey, I know you," Naruto said, "You're that guy from the roof yesterday."
"You've got me there," Kakashi admitted.
"What are you doing out here in the middle of the day?" Sasuke questioned.
"I went for a walk and fell asleep on the grass here," he lied.
"Mister, why is there blood on your face?" Sakura asked, worry etched in her features.
"What?" he walked to the stream and looked at his reflection. Sure enough, there were trails of dried blood under his eyes. Once he washed it off he turned back to the kids. "Sorry, rough night."
"What's your name?" Naruto asked.
"You can call me," he took a minute to think it over before answering, "Kakashi."
o-(=--
When the ninja reconvened they had searched the entire village, yet there was no sign of Kakashi. It was like he disappeared from the village entirely. "We can't spend all day looking for him," Minato admitted, "Return to your teams and we'll continue searching tomorrow."
"But Minato-Sensei," Rin tried.
"Rin you should go with Obito, I'm going to try to make sense of what we saw in the interrogation room," Minato told her.
o-(=--
When they got to the training fields the team was training harder than ever. Sasuke and Naruto switched back and forth from sparring to practicing the techniques Obito had taught them. Sakura was working non-stop on her chakra control. There were scattered kunai and a few shurikens sticking out of targets and the ground.
"What's happening here?" Obito asked them.
"Obito-Sensei," the three ninja shouted excitedly.
"The Hokage thought I should bring Rin and continue your training, but it seems like training never stopped," Obito chuckled, "How about we go for some ramen for your hard work instead?"
"Yeah!" Naruto shouted.
On the way to Ichiraku's team 7 talked about how much stronger they have gotten and plan on getting. Sasuke was still unhappy with his strength. Naruto was progressing nicely, training with Jiraiya had done him good. "So why were you training so hard?" Obito asked his students.
"Some guy was just sleeping in the middle of the place so we woke him up," Naruto started, "He asked how our training was coming along so we thought we'd show him what we could do. He was impressed, but said something about needing to push our limits, so I said, 'what makes you think you can judge us?', then, pow! He cut the leaves off a tree without breaking a single branch. It was AWESOME! He was just as cool as dad, or Pervy Sage."
"What about me?" Obito whined.
"Oh yeah, you too, Obito-Sensei, I guess." Naruto added.
"We're still not strong enough," Sasuke complained. "He could do that and I couldn't even follow his movements with my sharingan. I need to find that guy again, I need to learn that jutsu he used."
"Quit calling him 'that guy'," Sakura told Naruto while she punched him.
"Sasuke did it too," Naruto tried explaining.
"He gave us his name so why are you calling him 'that guy'?" Sakura sighed.
Rin was just about to ask who the man was but Naruto's excited, "We're here!" stopped her from asking. They sat down and ordered their meal. Naruto started telling Teuchi about his day, Sakura was asking Rin about medical ninjutsu, and Sasuke was asking Obito when they could start training again. The conversation took a lighter tone when the Jonin told the genin how proud and impressed they were of their performance in the Chunin exams before the abrupt interruption. As they continued chatting another person sat down at the shop.
"Hey it's you!" Naruto shouted.
"Naruto, not so loud," Rin scolded. They didn't seem to notice the new customer who had arrived.
"Sorry, hey mister, how are ya?" Naruto greeted politely.
"I have a name you know," he told Naruto, chuckling to himself. At this Sakura looked over.
"Nice to see you again, Kakashi," Sakura greeted him. This got all of their attention. Turning to look at the customer Rin stared at him for a minute.
"K-Ka-Kakashi?" Rin looked to Kakashi sitting in the corner of the shop.
"Yo," he waved.
"Miss Rin are you okay?" Sakura worried.
"Kakashi," Rin ran over to him, with tears in her eyes, and hugged him, not letting go, "You're here."
"Hey Obito-Sensei, how does miss Rin know Kakashi?" Sakura asked.
This forced Obito to come up with a lie to tell his team. "Kakashi was our teammate from the old team 7. He was sent on a mission before you all were born. I'm glad he's finally back," Obito explained. With a believable excuse out of the way Obito stepped out of the shop, "I'll be right back". With that he dashed to the Hokage's office.
Rin stepped back from Kakashi with a light blush on her cheeks. With the opportunity to talk to him, Naruto, Sakura, and Sasuke crowded around him asking him to teach them a few of his tricks. "I'll show you a few tomorrow," he told them, "Right now, I'm still tired from the mission so I'm going to eat my ramen and sleep in". The kids seemed a little let down at this. "Don't worry, I'll buy you all another bowl before I go".
They all seemed distracted by Teuchi cooking his specialty ramen for them. At that moment Naruto realized something, "Hey mister," Naruto looked over at Kakashi, "How do you eat while wear- Wooaah!" The entire bowl of ramen Kakashi had had disappeared leaving only the bowl and Kakashi looking like nothing happened. "How'd ya do that?!" Kakashi just sat there laughing to himself.
o-(=--
Rin was surprised. The Kakashi she saw at Ichiraku's was completely different from the one from the interrogation room, he was happy and always kind to the genin. The one from the interrogation was angry, scary, and overall, hurt. The meal was over too quickly. Rin soon found herself watching the genin walk down the road to go to their homes, leaving her alone with Kakashi, walking toward the forest.
"Rin," Kakashi spoke in a serious tone, "Did I hurt anyone yesterday?"
"No," Kakashi looked relieved, "But what happened to you in there?"
"You saw something neither of us wanted to," Kakashi looked into the trees, "You hear me! You shouldn't have seen that! I didn't want to see that again!"
As if on cue Obito, Minato, Anko, Guy, Kurenai, and Asuma dropped out of the trees. "For being ninja, you guys are pretty bad at hiding," Kakashi joked.
"Kakashi, what did we see yesterday?" Obito asked him.
"Minato-Sensei knows the answer, even if he hasn't told you, don't you Hokage," Kakashi stated more than asked.
The shinobi looked at Minato waiting on his answer. "It's been confirmed that those were his real memories," Minato told them, unable to meet their eyes. The shinobi who had circled Kakashi looked more shocked than they had when they first saw the memories.
"Rin, get away from him," Obito yelled.
"Why should I?" Rin challenged.
"He has memories of killing you, he's dangerous," Asuma tried to reason.
"He's still Kakashi," Rin stated, "He's still our friend!"
The shinobi, except Minato, took a fighting stance ready to strike at the first sign of ill intent. Kakashi took a step back ready to run. When he did, Asuma launched himself at Kakashi ready to strike with his chakra blades. Before they hit Kakashi a blur intercepted them, knocking Asuma back a step.
"Rin is right!" Guy shouted, "He's still Kakashi and that means he's still my rival, so I'm sure there is a perfectly good reason for all of this."
"Damn it, Rin! Why do you have to be right all the time?" Obito yelled while blocking a strike from Kurenai aimed at Kakashi.
The mission quickly got out of hand. The team was split in half. They were now fighting each other while trying not to hurt their comrades. Kakashi wasn't sure whether to turn himself over to Anko, Asuma, and Kurenai to stop the fight before someone got seriously hurt, or jump in to help the people who still trusted him. Before Kakashi could make a decision the fight abruptly ended when Minato shouted "Enough!"
At this the battlefield went silent, everyone stopped in their tracks. "Kakashi, welcome back to the Hidden Leaf Village, we probably won't understand what's happening for a while so it'll be nice to have you around again," Minato said, sporting a grin almost too large for his face, "Everyone, let's go to my office. Kakashi can explain everything there," with that Minato teleported away.
Hearing this Kakashi visibly relaxed. "Thanks for having my back, you don't know how much that means to me," Kakashi thanked Obito, Rin, and Guy. He then turned to Anko, Asuma, and Kurenai, "Don't worry, I won't hold this against you," Kakashi turned his back to walk toward the Hokage mansion.
"Kakashi," Rin called, "You're a part of team Minato, we'll always have your back." Kakashi looked to Obito who nodded in agreement. Kakashi smiled beneath his mask.
"Well, come on then, we better get to Minato-Sensei's office before he gets mad," Kakashi told them before turning back to Guy, "Guy, are you coming or are you just going to stand there all day?"
"Yes, onward to the Hokage's office," He shouted. With the sun setting, they walked down the road together to the Hokage's mansion. Looking at Kakashi they could all tell he was happy. If Kakashi wasn't wearing a mask they'd all see that he had a smile on his face larger than he has ever had before.