How the future can change~

Y/n POV:

*I was was finally having a day off from work as Naoto Tachibana my Co worker sent me to his apartment. We usually didn't do anything off work so I was quite confused yet I followed his invitation to be polite. As I walked up to his front door I heard people speaking from inside.*

???:"It seems like, that you can travel back in time to this day, but twelve years ago..."
???:"I'm freeking out here!"
???:"If you want to save my sister you have to stay calm!"

*My brain stopped to work. Now the door was opened and I knew, that I was caught.*

"Y/n?! You're already here?" said Naoto completely shocked

*I looked in his eyes but said nothing. My brain still could't work properly. What was this timetravel thing? *

"Come on in i'll explain everything to you." he said now in a calm voice.

*He lead me to a couch. I was now sitting next to Takemichi. I hardly even recognised him. He looks so different, compared to twelve years ago.*

"So, uh this might be a bit hard to believe, but we found out that Takemichi has the ability to travel back in time. If you don't believe us, it's fine. I wouldn't have believed it either, if someone told it to me like that." Naoto said this and I saw hope in his eyes. He really hoped I would believe them.

"Wait wait wait..."
I said completely confused.
"I thought I was sent here to work on a attempted murder on Hanagaki Takemichi."
I then told Naoto

"Yes that is right."
Naoto said in his professional tone as usual
"I wanted you here since we could really use your help in this case and you even know Takemichi from back then."
*Naoto remained calm*

*My eyes wandered over to a white Board and I saw a big gang around Tokyo that the police just couldn't get a hand on.*

"So tell me more."
I then spoke up calm yet still confused and not really believing them
"What is that timetravel thing?"
I added afterwards.

"You see. It's hard to believe I know. But it seems like our Takemichi here is able to go back in time to the excact same day twelve years ago."
Naoto then explained to me more detailed.
*I meanwhile stared at the two of them as if they lost their minds.*
"Okay."
I nodded and answered them still not sure if I believed them.
"And what has that to do with the Tokyo Manji Gang?"
*I got up and walked over to the white Board pointing over to the leaders of the so called Tokyo Manji Gang.
The names read Manjiro Sano and Tetta Kisaki.*
"Well as you know my sister had been killed by a Terrorist Attack coming from the Tokyo Manji Gang. If Takemichi wouldn't have travelled back in time I should have died there too."
Naoto spoke as if it was the clearest thing in the World.
*My eyes blinked several times.*
"So What's your goal?"
I asked still confused
"To save Hina."
Takemichi spoke up for the first time.
*I let out a deep sigh. Hina Was my best friend and her Death was still close by. Her Death hurted me bad.*

*after they explained the whole situation*

"So your plan is to go back in time and tell me everything back then and hope that my past self believes you?
I asked raising a eyebrow
"Well...yea that was my plan."
Takemichi sighed deeply
"Y/n is right. What happens if she doesn't believe you? Then she tell Hina you're a Psycho and that was it."
Naoto shared his thoughts now as well.
"I mean it's worth a try. Isn't it?"
I then looked up at both of them determined
"Hina Was my bestfriend, if there is a chance to save her I wanna help too."
I then got up and layed a reassuring hand on Takemichi's shoulder.
"If my past self believes you, then I will give you my help."
I then said calm with a kind smile
"Thank you Y/n, your understanding means a lot to us."
Naoto smiled back a bit.
"Takemichi give me your hand and we will save Hina."
Naoto added
"Oh right."
Takemichi then spoke up nervous.
I noticed he hadn't changed at all. He was still the same old Messy dude like back then.
Then Takemichi gave Naoto his hand and a second later Takemichi went unconscious.
"Hey Y/n mind helping me out?"
Naoto asked with the unconscious Takemichi on his arms.
"Sure sorry."
I said as I helped him pick up Takemichi and lay him down on the couch.
"What now?"
I asked confused
"Now we wait."
Naoto answered