Spy Classroom, Vol. 5 (Light Novel): Fool Erna Once (novel)

The girls of Lamplight may have all washed out of their training at the spy academies, but under their leader, Klaus, they've managed to take on Impossible missions with resounding success. However, now another spy organization, one consisting of the best of the best from the academies, is in need of a leader-and they've got their sights set on Klaus. Is this the end for Lamplight?!