Grisaia Phantom Trigger 01 and 02 begins the visual novel spin-off series set in the Grisaia franchise, following a new cast of students at an academy that secretly trains young agents for dangerous missions.

Presented as a visual novel, it unfolds through character-driven dialogue, tense action scenes, and the relationships between its cast, adding another chapter to the Phantom Trigger storyline for fans of the Grisaia series.