[Atsumu............... She feels increasingly more guilty as this goes on, but at the same time, someone had to tell him? Guess that just ended up being her, alas. Her flappy ears remain lowered on their own, this sure is a dilemma...]

Someone in Heliopolis? Or... Um, maybe a shopkeeper at a store that sells clothes accommodating for ears and tails could be worth a try too, also other festival goers like us who aren't dressed properly for it yet?

[Are they going NPC hunting...]