The heroic duo Ysphere, consisting of Ysflare and Ysaqua, fall into a sinister trap set by the villainous Omega. Captured in a brainwashing laboratory, the celestial princesses are subjected to potent aphrodisiacs and psychological torture designed to break their will. As their mental defenses crumble, they are conditioned to embrace their degradation, transforming from defenders of justice into mindless subjects of their captors.
Ysflare is held captive by Void-sama, who has corrupted her partner Ysaqua into a lust-driven weapon to break Ysflare's will. Through extreme psychological and sexual manipulation, both warriors are stripped of their dignity and brainwashed into abandoning their pursuit of justice. Now transformed into the "Evilphere," the former heroes are publicly humiliated and enslaved, serving as pawns in Void-sama's sinister plan to ascend to godhood.