Frontwing launched the opener for the upcoming addition to the visual novel series of Grisaia called Grisaia: Phantom Trigger, coming simultaneously in two volumes Spring 2017.

The opening video shows off characters and themes from the visual novel. Furthermore, the story will star a new cast of characters, Fukami Rena, Shishigaya Tohka, Kujirase Sakurako Christina, and Ikoma Murasaki, who now attend Mihama Academy.

More information is still coming in waves about the characters from the developer, but here's what they've shared so far about the visual novel's premise:

The goal of SORD is to train a new generation of operatives to defend the country against future threats. To that end, the organization has established a series of schools up and down the country. Mihama Academy, more-or-less left to rot after its abrupt closure, has been given new purpose as one such ‘specialist training school’.

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. Mihama now entrusts the misfit girls who attend it with guns and live ammunition. Paying their own safety no heed, these student are again and again plunged into dangerous extrajudicial missions – all for the good of the realm.

Artwork and character design will be by Akio Watanabe and Story will be written by Ryuta Fujisaki.

Currently, Frontwing is working on Volume 3 of their Corona Blossom series and they've just hit the PlayStation Vita stretch goal for their Sharin no Kuni localization Kickstarter with Tokyo Otaku Mode.

You can check out the opening video below: