Spy Classroom Vol 3 Light Novel

Spy Classroom by Takemachi. An Action light novel rated Teen, published in English by Yen Press.

Klaus is the greatest spy in the world, and he's been tasked with an "Impossible Mission" that has wiped out every team sent before. His new team? Seven girls who were failing out of spy school. Now he has to turn them into elite operatives, though he's a terrible teacher.