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.
"That"?The Important Customary EventAnd what's more, that season is almost upon us, right?Isn't that kinda hasty?Nagato-san!Message from HQ!Already that time of year, is it?Though it must be said that it is dangerous to have our main forces away from home for so long...The return order has come!Ehhh...WE GOTTA GET BACK!CRAP!
THE SAURY FISHING!?さぅりーSouth of France
Côte d'Azur
The French Riviera