Duffle Coat Army

Six students transferred to a high school on the same day. They go out together to a karaoke bar after school, except it's not the usual girl talk, but a strategy meeting? The Yamato Liberation Front is behind a bombing plot that is secretly targeting the school. In order to save the school and the country from the crisis, the "Duffle Coat Army," a special unit made up of the six high school girls, moves into action!

(Source: Kadokawa, translated)