So, the すれちがい広場 is here. It’s about twenty minutes walk from Ueno Station. (I admit, I feel Kotoha’s pain on how hard it is for that sort of pass-play interaction - I have one of the Pokemon games on my DS which rewards you for walking past other people who also have the game loaded, and I think even walking up and down my university campus only netted me one single interaction.)
On page 58, Yui is near Pagoda Yakushi-do, though since street view is lacking in the area (there’s only a few scattered, and blurry, photospheres), I can’t pinpoint her precise location. She would have to teleport about 200m between the second and third panels, however.
Apparently やがんだ is a contraction of 嫌がるんだ (source). いやがる according to Jisho means “to appear uncomfortable (with); to seem to hate; to express dislike”, and according to whatever example sentences I could find it basically seems to add a negative twist to the sentence it’s in. I’m also unsure how to interpret だいたい here. Generally? Roughly? In the first place? I think overall your translation is fairly accurate.
Panel 2 - kotoha: すれちがいだが？
すれちがい is apparently Streetpass on Nintendo 3DS (thanks @ChristopherFritz, I had no idea), so she’s answering “it’s Streetpass (the reason we’re here)”. が is the usual trailing が that usually softens the sentence, but in this case I feel like it’s more of a challenge ("do you have a problem with that?). Maybe it’s not though, maybe she’s just implying that it’s not working as well as she expected.
Panel 3 - kotoha: ヒーローってのはなあ
An unfinished sentence. I don’t think that’s Kotoha but Satchan. She was saying that they’re not lazing about, then she continues “As heroes, …” and then trails off with なあ (thinking aloud) and immediately after asks “なんだって”? (What was it?).
Thanks @omk3 for that reference confirming that やがんだ is a contraction of やがるんだ. If you read the right manga やがる is used in every other sentence. The bad guys in Dragon Ball can barely utter a sentence without using it.
I feel like I usually see it following the -masu stem of the verb, but references out there show it can be used after -te form as well. (If you look up やがる on Jisho it doesn’t mention this, but if you look it up on ichi.moe it does).
As well as indicating disdain/hatred for the person you are talking to, it also has a curse word feel to it (How to Japonese link). So in this sentence perhaps it might be translated as - So what the hell are you lot up to? ; or in a different context - What the fuck are you guys doing?
だいたい has loads of meanings in Jisho. Perhaps here it’s the “first of all” meaning. I’ve translated it just as “so”.
Another one of those where I can get the puzzle pieces but just can’t make them fit together
Is the main part of the sentence 余裕どこ? I can’t fit them together and that breaks the entire sentence for me as the other parts feel auxillary to it.
She first said it when they were hiding behind the tree where Yui was counting. She was trying to say 灯台下暗し(とうだいもとくらし) which means “it is darkest under the lamp post; it’s hard to see what is under your nose”. That phrase would have made sense given the situation.
But it’s a complicated phrase and she’s only young so she’s said it wrong, saying something that doesn’t make any sense.
For what it’s worth the Tokyo University campus is just the other side of Ueno Park.
I read this as - That degree of surplus! Where is that? i.e. Where do I find this place which has an excess of people with streetpass?
余裕 is one of those words than only end up being confusing when you look them up in an E-J dictionary. “Surplus” almost never fits. From what I understand from coming across it multiple times, it basically means that something is easily within one’s capabilities, be it time, space, money, or whatever else. That there is room for it, for want of a better word. Or even a surplus of room, to be more exact. So when Saito teases them by saying they’d never walk that far, Kotoha counters “This much is easy”/“We could easily walk even further” At least that’s how I understand it.
I was torn between whether the 余裕 referred to the amount of Nintendo devices that would be there, or the amount of time it would take to get there. From the flow of the conversation it immediately follows Saitou’s comment about the time to get there so probably the second makes more sense. So I prefer your translation to mine.