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

This is the sequel to The Labyrinth of Grisaia. It is strongly recommended to play the first and second game before starting this.

He thought life at the academy would never change.
Everyone marched forward in the same direction, matching step for step; before he knew it, he began to surrender to that illusion.
He believed that he would only arrive at the same place if he continued down the same path as everyone else.
Then he realized.
Just as there are as many paths as there are people, no two paths are identical.

—"Asako. I've already saved the five of them, you know?
So it's all right, isn't it...? It's all right... for me to die now, right?
I know that even if I save somebody, it doesn't mean I can erase my past.
Still, wouldn't it mean I can die with a smile on my face?"

"I might not be able to see those girls anymore.
But at least those memories would stay in my heart forever.
Still, this unforgiving world isn't full of girls sweet enough to be satisfied by those words alone."

That was the truth one young man finally understood...

The final chapter in the Grisaia series, featuring Prologue De La Grisaia, a prologue set before Yuuji's arrival at Mihama; Blanc Aile no Tane, the overarching story's grand conclusion.

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: Frequent Violence or Gore, General Mature Content