Moonspeaker said: "Nnaaah! Nnaaah!" (I'm assuming from context that this is a noise Nanachi makes.)
Yeah, it's a reference to Nanachi trying food scene(obviously, minor/major Made in Abyss spoilers at the link)
Made in Hiroshima City
The Kaga sure was a lot of fun!We were able to enjoy our fill of it more than in Kanazawa!Since you've come here too, Kogasa, let's go get something good to eat today.This was quite the extreme event!Well, you reap what you sow.Eat up!♡Nnaaah!♡Nnaaah!♡