This is from a while ago, though. I presume it was one of the bonus sections of the doujin book that is being released for free on Pixiv only now (because sales of the book are over). She even mentions sanma/saury in the last panel, which is an autumn event.
Can I say that I love recursive translation note gags?
Also, relaxed Nagato out of her gear is barely recognizable in cases like this.
South of France
Côte d'Azur
The French Riviera Though it must be said that it is dangerous to have our main forces away from home for so long...The Important Customary EventAnd what's more, that season is almost upon us, right?さぅりーCRAP!
THE SAURY FISHING!?WE GOTTA GET BACK!"That"?Ehhh...The return order has come!Already that time of year, is it?Isn't that kinda hasty?Message from HQ!Nagato-san!