At the mention of "only friend", Minato very distinctly looks betrayed.
He pauses, before continuing, as if considering what, exactly, he intends to say.
Alternatively, he's wanted to say this for a very long time, and he's trying to get his words together in a way that makes sense.
"Yeah, you're right, you are one of my only friends. And so are Yuki and Faith. And you know what? I thought that one of my only friends would trust me a little more. I thought that one of my only friends would understand that yes, I can screw up massively, because I'm not the smartest person. I know that I've done you wrong Noriko, and for that, I am very genuinely sorry, even if you won't believe me right now, or ever, and I don't care if you don't. Because you're very right, you ARE one of my only friends and I do care about your wellbeing and I do want the best for you even I don't know HOW to do it, no matter how much shallow or stupid you think I am. Like every stupid and vapid wannabe popular girl who thinks she'll get free money out of me if she smiles cutely, compliments me and offers me actual friendship like I'm the one in distress. Because that's all I am to you right now, isn't it? Some dumb rich kid playing hero who wants a damsel in distress who couldn't possibly understand actual pain or actual hardship. You know, like I am to everybody else. But, you being one of my only friends, you should know that, shouldn't you? Because I'm such a dumb rich kid, I couldn't possibly understand what being lonely and alone feels like, right? I don't have many friends but all this fucking money makes it all better, right?"
The tone of Minato's voice lowers and clearly becomes more and more furious, the sort of tone he generally reserved for the sort of people he was about to evict out of a room by way of the nearest window.
"And yes, because you're one of my only friends, you think I haven't wanted to bring you into this part of my life for years? I dreamt about it a couple of times, you know. You, me and Yuki, seeing Aethertide together. You, me and Yuki, fighting bad guys together. So I wouldn't have to do it all or see this all without being able to tell my only friends about it. I know, you've been dealing with this your whole life, and it doesn't compare, and for that, I'm sorry again. But you think I don't know anything? I get shot in the head on an almost nightly basis. I put my life on the line on an almost nightly basis. I've taken so many hard beatings and shots on so many levels. And I couldn't even tell you about it because I didn't even goddamn know you knew. If I'd known, I wouldn't have left you alone in the dark. You don't trust that I would, but I wouldn't have. Because I do want to be a better person than you think I am."
He shoves Noriko's hand off of his collar.
"Could I even tell you that members of my family died doing this kinda thing, that my own grandmother died doing this? No. Could I tell you that some jackass broke into my house, tried to kill me, and the first time I ever even used my powers was to fight that jackass and protect myself from someone who wanted me dead probably for something I hadn't even been born for? No, I couldn't tell you. I couldn't tell my only friends about the fact that I almost died, and I couldn't tell my only friends about the fact that I put myself out there every night to stop the same kind of thing that happened to you and me from happening to other people. There was so much I couldn't tell you."
He takes in a breath as he begins to calm down, realising he'd messed up.
"I hoped that my only friends would trust me enough to be able to come to me when things went wrong instead of suffering in silence until it was too late for me to fix anything. Because you're entirely right, I want to play the hero. And that includes doing everything I can to help. And I can't do that if I don't know that there's even something wrong, or even how to fix it. I'm sorry I didn't know, I'm sorry I don't know how to fix it and I'm sorry that I'm not the hero to you I hoped I could be. I should've understood that you weren't used to this like I was. That this wasn't the world you were used to. And I'm sorry."
The look of betrayal is still very distinct on Minato's face, however, even as he looks very much apologetic.
"You're right, I should've checked on you. You're right, I should've done that for you, and for that, I'm very genuinely sorry. I shouldn't have said what I said, then or now, and for that, I'm sorry. I have done wrong by you, and for that, I'm very, truly sorry, and I'm not sure I'll ever really make it up you."