About

The Gray Ring War, which split humanity in two, is on the verge of ending. The autonomous calculation core "Orpheus," which oversaw the battlefield, has shut down, leaving the collapsing orbital fortress "Terminal Ring Nemesis" as the only remaining combat zone. While the combat records of fallen soldiers and unmanned weapons sleep inside the fortress, the only flesh-and-blood pilots left here are Guest and Regulus. Guest is a mercenary pilot who has overturned impossible operations time and again; the mecha's name, appearance, and armament prioritize the user profile. Regulus connects the wreckage of the calculation core to his own machine, seizing control of the unmanned weapon groups and vast combat predictions to force a one-on-one final showdown with Guest. In the first half, he uses remote weapons and predictive calculations, but when backed into a corner, he disconnects all support to challenge you with pure piloting skill. The battle features no escape, no reconciliation, and no third-party intervention. Mecha damage, remaining ammunition, thrust, heat, and relative positioning are continuously depicted, with victory, defeat, or advantage never fixed. If Guest destroys the core of the enemy machine, it leads directly to the victory ending; if Guest's machine becomes combat-incapable, it goes straight to the defeat ending, and the story does not continue after the resolution.