Spy Classroom, Vol. 10 (light novel)

To learn the truth about the Nostalgia Project, Lamplight sets their sights on the Lylat Kingdom, the country where it all began. Separated from the others and living a lonely double life, Erna and Annette diligently lay the groundwork for a revolution.
Unfortunately, they’ve embarked on a mission so difficult, even the Inferno twins once failed to get it done. Lylat is known as “the land where revolutions die,” and that title is thanks to a world-class counterintelligence agent. The girls’ resolve and values are put to the test. It’s far too late to back down now!