It took a bit of explaining as Takezushi was still clueless about the profession of Heroism, but in the end he was convinced to give up on turning the world against him when he could essentially do the same thing that he wanted without the needless hassle if he just followed worked to achieve one simple goal; to enter a High School centered around creating heroes.
"Mhmm… I understand why and how I need to achieve the task you set for me, but tell me again Mr. All Might, why am I stuck living with you?" Takezushi had finally learned the hulking hero's name!
"Young Takezushi, tell me… Would you prefer living in some random foster home? I mean, not to brag but I'm proposing a pretty sweet deal, no?"
"Yeah, not really..." Takezushi answered candidly.
Taking a hit from atop his metaphorical high horse, All Might flinched as he said, "Wh-Do you know how many aspiring youngsters around the world would kill to live with me?! To learn from the number one pro he..."
"Gee, you sure do repeat that a lot… And could you not phrase it like that, it makes you seem like some sort of weird pedo..." Takezushi was honest… honest to a fault, even. His words were like swords slashing through All Might's ego.
…
After the police investigation regarding the incident between Takezushi and the police station was concluded, Takezushi didn't face any legal troubles as All Might vouched for him and even volunteered to pay for the damages their fight caused. As Takezushi watched all this unfold, he couldn't help but admit that while the old man had a bit of an inflated ego for being the number one pro hero, his wallet indeed confirmed his words to be true.
Thus, after settling the matter of the police incident and going through the process of granting All Might custody of Takezushi as his legal guardian, All Might and Takezushi took a train to Tokyo. When asked by Takezushi why they were going so far — they were literally crossing prefectures — All Might responded, "That's where I currently live! It's also where my office is located."
"If that's where you live then how could possibly have been the first person to respond to the incident at the police station?"
"Luckily, I happened to be in the area. You know, uh... conducting hero business and nothing but..." He didn't sound very convincing but that didn't seem to matter as Takezushi didn't bother pressing the issue. All Might appreciated this as he didn't want to confess that today had actually been one of the few days in the year where he took a vacation day to visit an old friend at the nation's greatest hero school; U.A. High.
…
After a stressful train ride with dozens of civilians running up to All Might and countless kids asking for autographs and pictures, the overpowered pair made it to Tokyo Station. Upon leaving the train station and walking to a skyscraper not three blocks away, All Might brought Takezushi to his new home. Located at the top of the thirty-story tall highrise, Takezushi was surprised to find out that half of the penthouse suite was All Might's home; the other half was reserved for business and was the headquarters of his office.
After getting a tour of his new home from All Might, Takezushi was left not knowing how to react. A day ago he was living as a farm slave for the North Koreans and today he was living under the same conditions as the greatest hero in Japan and probably the rest of the world. To bring Takezushi out of this state, All Might became serious as he took a seat in the living room; gesturing to Takezushi to follow his lead.
Picking up on the atmosphere changing, Takezushi snapped back to reality. Without a word, he took a seat on the L-shaped couch across from All Might. "Young Takezushi, now that we'll be living together I suppose it's best we become open with each other from the start..."
Squinting at the terribly constructed sentence, Takezushi was left in shock as he saw the previous hulking form All Might had been in all this time poof away in a cloud of smoke to reveal a frail and damaged old man. "It's only fair that I start as I'm the one who needs to earn your trust. So, I hope you can take a while to listen to my story as it happens to connect with what happened to your mother."
Nodding at All Might's request, Takezushi sat back as his new foster father explained his history with All for One. He lifted up his shirt to reveal a horrifying wound hidden to the left side of his upper torso and talked about why All for One might want to capture a descendant of the Sakuraboshi bloodline. Going so far as to reveal that he could only operate for a limited period of time every day because of the wound All for One dealt him in their previous battle, Takezushi was left reflecting on how genuine and sincere All Might's intentions were.
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"So this All for One guy's quirk gives him the ability to steal and freely gift quirks and the reason he wants my mother is to conduct experiments with her blood? He wants to mess around with the DNA in her blood and take any recessive quirk gene's she might possess..." Upon formulating his own conclusion with all the information All Might gave him, a horrifying killing pressure shot out from Takezushi's body. 'That filth wants to experiment on MY MOTHER?' Unable to control his fluctuating emotions his Sharingan manifested.
All Might, or Toshinori Yagi as he revealed his real name to Takezushi, went over to the unstable boy and put both of his hands on Takezushi's shoulders. "Calm down, Young Takezushi! Listen, while All for One is a ruthless villain, he is careful and cunning with his plans. As we've already discussed, your mother is Quirkless so that villain won't be able to instantly steal the Quirk she might have lying dormant in her genes. He'll definitely have to take his time researching the subject so for the next couple years you can rest assured that he won't kill her. "
"But he'll have to 'research the subject,' right?" Takezushi repeated as he looked just about ready to start a massacre. He continued, "What he wants is locked in my family's bloodline… I guess it's safe to say that while he won't kill her, she'll be stuck living a life worse than death as her blood will often be syringed out of her body in the name of advancing his goals." Takezushi bit his lip hard enough to draw blood as his fingernails pierced the flesh of his palms; he was absolutely livid.
Yet at the same time, along with the hate he had for All for One, there also seemed to be a deep sense of emptiness and regret. He had promised himself that an incident like the one that had happened between his mother and the man from the station two years after his quirk awakened would not repeat, and here he was, hopelessly unable to do anything as something far worse would befall the last living member of his family.
He was an almighty powerhouse possessing enough firepower to flip entire countries into chaos singlehanded. Having grown confident to the point of arrogance, he let his guard down —for quite literally a few moments — and now he felt the whole situation was his fault. In the end, he was just a fourteen-year-old and as powerful as he was, he was still subject to the emotional sensitivity of those around his age. In fact, he was definitely more emotionally sensitive as the matter revolved his mother, who was the only person alive that he cared about.
Blaming himself, even to the point of even feeling worthless and unworthy to continue living, Takezushi cried. He had not cried since that traumatic day when he was five and as the torrent of negativity welled up inside him, growing dangerously close to turning him suicidal, a single hug stopped him in his tracks.
All Might, not bothering with his own personal safety as he felt a tangible danger from Takezushi, did the only thing he could think of doing in this situation. He treated the boy, not as some sort of overpowered titan, but a scared child and that was exactly what Takezushi needed in what could be called the darkest moment he had experienced so far in his life.
"Young Takezushi… You have to stand strong. I can see it in your eyes, that depressed look is something I can recognize from a mile away and I need you to know that suicide isn't the answer. Don't blame yourself for what happened as there's no way you could have predicted the future..."
"B-but my m-mom..."
"How do you think she would feel if the day came when she was rescued and her son had already passed away before she could see him one last time… Besides, while it's true that One For All has yet to be caught or decades, but you have to look on the bright side." All might said as he distanced himself from Takezushi to hold eye contact.
"It is a well-known fact that with every coming generation Quirks improve and become more powerful. Perhaps in the coming years or even months, new heroes with evolved tracking quirks will lead to the breakthrough that will result in finding All For One."
As he wiped the tears and snot off his face, Takezushi asked, "Really?" To which All Might stood up, his features disappearing as the sun was perfectly placed behind him with its rays piercing through the one-way transparent mirrors of the penthouse suite. All Might returned to his hulking form as he flashed his trademark smile and said, "Of course, Young Takezushi! And if you want to participate in the raid that you need to work hard to enter a Hero School."
Extending his hand to Takezushi, All might asked, "So, Young Takezushi, will you promise me you'll work hard to rescue your mother?"
Taking his hand, Takezushi said, "R-right..." His shortness of breath impacted his words.
"Good!" All might said, before he reverted back to his true form. "You're going to need to work hundreds of times harder than anyone if you want to make it into a Hero school next year as you're currently nine years behind when it comes to formal education. But I'll support you in every which way I can!"
"T-that wo-won't be a p-problem… My Q-quirk can s-solve that is-sue no problem." Takezushi said as he was starting to calm down.
"Your Quirk? Actually, now that we're on the subject what exactly is your Quirk?" All Might asked. He had originally planned on discussing this after opening up to Takezushi.
"My Q-quirk? It's a Mutant t-type Quirk that gives me an energy pathway s-system; kind of like a regular person's circulatory system." Seeing the look of confusion on All Might's face, Takezushi tried to use an analogy asking, "Are you familiar with cultivation novels?" Seeing All Might nod, Takezushi replied, "I'm kind of like a cultivator, only I'm not trying to reach some sort of enlightenment or gain immortality." Half understanding, All Might gained a rough idea of what Takezushi's Quirk was, but he would only slowly come to understand how ridiculous the extent of his abilities was as time passed while they lived under the same roof.