Spy Classroom, Vol. 9 (light novel) — Takemachi

WHAT HAPPENED TO ANNETTE…?After the fierce battles in Fend, the members of Lamplight were granted a two-week vacation to spend on a beautiful island. However, Klaus issues a mysterious order -- they have to stay separated except on specific days. And on the final day, Annette is nowhere to be found. After dealing with the island's pirate legends, a cursed murder case, and a girl claiming to be Klaus's fiancée, Lamplight must piece together the scattered memories of the previous thirteen days to locate their missing comrade.