The clip has a voice over??? How to do that?

Hildr: Again, how many times do I have to say it, Ölrun? No, we shouldn't. How about you just let go already? Ölrun: No, I can't! It's definitely something we should be concerned about! Even if you're older by time of activation, I can't let that slide! Hildr: Eh, we were made at the same time, so I don't think that matters much anyway... But that's not the point. No means no, don't you get it? Ölrun: Why are you so stubborn! More stubborn than our individual deviations should allow! Hildr: Put your hand on your heart and say that again? Ölrun: Ugh! That's, um... [Hey now, wait a minute] [Can I have a moment, you two?] [What are you arguing about, exactly?] Hildr: Ah, Master, right on time! I've got something to tell you. You see, Ölrun was... Ölrun: A-ah! No fair, Hildr! If that's how you're going to go, then I've got a thing or two to say too... Hildr: It's okay if you don't, you know? Ölrun: Hildr! Hildr: I kid, I kid. That whole story's over, anyway. Ölrun: Eh? Hildr: I mean, it's Valentines already. And Master's right there. So time's up! I don't see another way to give it, is there? Ölrun: That's, um... that's true... [I still don't understand, but...] [Is that so?] Ölrun: Uuu... It's my loss, Hildr... Hildr: Haha! Man, you're so cute, Ölrun. We're all of the same origin, so there's no winning or losing here. Even if it looks like I'm winning, in the end it's a victory for all of us! Ölrun: Y-yes, that's true! Then, I guess it's time to move out... Right now? Hildr: Yep. Ölrun: So here we go, then. Master! [Yes?] Ölrun: Here! (The scenery turns into a beach) Ölrun: First step was a success. Now that illusions have been generated through runes... Master! [CHOCO GET!] [Whoa, cool!] [Chocolate grenades...!] Ölrun: Yes, it's chocolate! I thought it wasn't really cute like that, so I was insisting on adding a ribbon, but... Hildr is right. Now that we've encountered Master, it's now or never! There's no ribbon, though. Sorry... Hildr: Come on, no need to be so sad. Calm down, Ölrun, and look. "It's a big occasion, so I want to make the present as cute as possible." I totally get the sentiment. I fully agree, even. It would definitely be cuter if there was a ribbon. But, also... It would mess up the point of making them grenades. If the ribbon was there, then what you were going for becomes hazy, doesn't it? Ölrun: .................. That's... a good point, actually. Hildr: Hahahaha! Right? Ölrun: It's true, but... eh? I got the point that easily, yet I went all the way to arguing with Hildr about it... Eh? That means our thinking was unsynchronized... That shouldn't have been the case, and yet... eh? Eh? Could it be, that... I am defective as a Valkyrie...? Hildr: WRONG! Okay, I can't actually say for sure since Father isn't there, but don't worry, Ölrun. Ortlinde and Thrud are like that too. Rindr and the others are probably also getting there. Ölrun: ......? ... really? Hildr: Fu fu fu. Indeed! (... as far as I know, anyway.) We war maidens are a sensitive bunch. So all sorts of new behaviours can happen! Your Hildr-neesan's got a flair for that kind of thing. You just became an adult! Ölrun: W-Wasn't there a better way of putting that!? Hildr: And now she's all red. What a cutie. Ölrun: *cute noises of increasing discomfort* W-well I also know your embarrassing cute points, Hildr-neesama! Hildr: Eh? ... and Ölrun, there's a neesama now... Ölrun: Hildr-neesama, yesterday you stayed up all night in the cafeteria without synchronizing any info! In other words, that means you pulled an all-nighter of gossiping with the fangirly Heroic Spirits! Hildr: Eh? I mean, we did talk a lot, but that's all, really... [Hm?] [Sorry, I couldn't hear after "in other words"...] Hildr: And it's fine if you didn't! Nothing, nothing, you heard nothing! Got it!? [Too close too close] [Please don't get right in my face while covering my ears] Ölrun: Hildr-neesama's approach is amazing... wait, no! Not fair, Oneesama! [Oh god now you're both too close] Hildr: Why unfair? All I'm saying is that they don't have to hear that... Ölrun: You're pretty much glued to them! Oneesama, when did you get that into it! Don't tell me, you feel something special about this day- Hildr: ......? That's not true... .......... ... I think... .......hmmmmm? Hmmmmmmm...?