The latest installment in the Grisaia series: Grisaia Chronos Rebellion

In Grisaia Chronos Rebellion, characters from the original Grisaia Trilogy and Grisaia Phantom Trigger join their new friends in an all-out battle against a deadly terrorist organization.
https://store.steampowered.com/app/2348360/Grisaia_Chronos_Rebellion/

About This Game

Grisaia: Phantom Trigger is a visual novel series set in the world of the acclaimed Grisaia franchise, featuring a totally new storyline and cast of characters, and brought to you by returning character artist Akio Watanabe and writer Ryuta Fujisaki.

Story:
This new incarnation of Mihama Academy is home to a diverse group of students, who every day work to polish their unusual skills - sometimes on the job. There's a gunslinger called Rena (nickname: "The Rabid Dog"), a sniper named Tohka, a demolitions expert called Chris, a spy named Murasaki, and finally, Haruto, their handler. Together they make up an agency called SORD (Social Ops, Research & Development). The specialist training school now entrusts the misfit girls who attend it with guns and live ammunition in the name of national defense.

Paying their own safety no heed, these students are again and again plunged into dangerous extrajudicial missions - all for the good of the realm.

"We've been granted a place in the world.

That alone isn't enough - there wouldn't be any meaning in living, if that was all we had...

It's not enough just to get by on the backs of others. I live by my own strength, and I fight to survive.

Because only the survivors among us belong with the living..."

No matter how much life grinds them down, what future awaits these girls, who've themselves chosen the path of the gun?

Mature Content Description

The developers describe the content like this:

This Game may contain content not appropriate for all ages, or may not be appropriate for viewing at work: Veiled Nudity, Frequent Violence or Gore, Use of Tobacco, General Mature Content