Zegapain: STA

After Project Resurrection is completed and the final battle with Gards-orm ends, the Celebrants continue hunting the enemy forces that remain. Kyo Sogoru then wakes in a snow-covered winter version of Maihama, troubled by missing memories and the feeling that he has somehow spent far too long in summer.

Before he can make sense of the gaps, a new force called Olta Moda appears. Hal Welt, who calls himself a Hikaritatsumono, attacks with the unknown power of Substance Shade. With help from the AI Loopa, Kyo recovers the memories he lost and returns to battle with new anti-light equipment, only to discover that this conflict is the opening move in a struggle over the very existence of two worlds.