Secret Mission Sennyuu Sousakan Wa Zettai Ni Ma Best: Updated

"Abort?" Tsumugi asked. "If you go in there, you might not come out."

You mentioned "Secret Mission" in your request, which is likely a translation of the "Sennyuu" (Infiltration/Undercover) part of the title, and "Ma best" seems to refer to "Makenai" (Won't Lose) or simply expressing that the series is "the best." secret mission sennyuu sousakan wa zettai ni ma best

Here is a deep, noir-style story based on that title. "Abort