Etna blinks for a moment. "Wait, what? Arcade room? Why would we even have something like that here?" asks Etna, wondering if Flonne is more high on life than she usually is.
Flonne giggles. "Well yeah, of course we do! I wouldn't have suggested something that doesn't exist!"
"Knowing you, Flonne, you'd probably suggest something that's only in that airy little head of yours." says Etna. "But, I'll bite, let's go see this 'Arcade room', then."
Ignoring the insult, Flonne giggles with enthusiasm. "Now then, we need to actually find it! I know I saw it, I just forgot where..."
Etna can't help but facepalm at this. "Oh well, we've got nothing better to do anyway, let's get moving, then." With that, the two girls wander around in search of something that may or may not be a figment of Flonne's active imagination.
Eventually, the girls find a light source that's brighter than what is normal for the castle. "Ah, those lights look like the lights used for the arcade! This must be it!" Flonne says, as she runs ahead of Etna. Etna runs after Flonne in order to prevent Flonne from absentmindedly trigger what might be a trap for all they know.
Etna looks over the entrance while Flonne eyes light up from all the pretty lights. "So, you've been inside, right? I mean, I'm sure you wouldn't think this place is an arcade just from the entrance, but I just want to make sure."
This seems to frustrate Flonne just a little. "Come on, Miss Etna, give me some credit! I know things besides arcades use pretty lighting like this! Like theaters, and..."
Etna interrupts. "...and Arcades and elaborate traps, right?"
"Exactly!" says Flonne. "And all of those things could be fun, but I'm sure this is an arcade! Or...maybe it's an arcade that's an elaborate trap...or a theater that's an arcade, or even a theater arcade that's an elaborate trap?"
Etna shrugs, knowing Flonne's moments away from running in anyway. "Well, what are we waiting for, then? That trap's not going to trigger itself."