Best I can find is that it stems from the food dish usually having two shrimp (i.e., a repeated ingredient) on top. Of course, I can't verify the accuracy of the sites which claim that, so take it as you will.
I found this translation problem cropped up before in post #715761, and I liked how the translator handled it, so I've tweaked the translation here to reflect that instance.
Poor Yuyuko. She's about to discover whether a ghost can be undone by Reimu + boundary manipulation.
Actually, she's got some new intel to share with the others first. About the few BL doujin Rinnosuke has on his table.
Is that so?It seems like Yukari has been out since morning.I was out and about during the day... so I don't really know.Nah, I don't think Yukari would come here...So I thought she might be here.