Two years after a devastating conflict with the alien Festum, the survivors on Tatsumiyajima Island struggle to rebuild their lives. The island inhabitants try to maintain a semblance of normalcy, harboring the emotional scars and memories of those lost. Kazuki Makabe, a young pilot who fought valiantly against the Festum, finds himself haunted by the mysterious disappearance of his friend, Soushi Minashiro. Life takes an unexpected turn when a new Festum threat emerges, putting the island in grave danger once more. Amidst this turmoil, Kazuki discovers a cryptic message that may lead to Soushi, fueling his determination to uncover the truth.

As the island prepares itself to fend off another enemy assault, various secrets about the nature of the Festum and the island’s own hidden technologies begin to surface. New alliances are formed, and old ones are tested while the residents rally to protect their home. Conflicting emotions and unresolved grievances come to the forefront, challenging Kazuki and his fellow pilots to confront both external threats and their inner demons. With each revelation, the stakes rise, compelling the island’s defenders to face harrowing decisions that could change the fate of humanity.