Spy Classroom, Vol. 3 (light novel)

Some Things Are Best Left in the Dark After the mission to take down Corpse, Thea, Monika, Annette, and Erna have earned a break. Unfortunately, their relaxing vacation will have to wait, as they soon find themselves face-to-face with Annette's mother-although Annette herself has no memories of her past. While the emotional reunion initially brings everyone together, it isn't long before fissures begin spreading throughout the team...