Cosmo Angel sets out to locate Professor Yomizaka, a renowned biology expert who has gone missing. She confronts a petty villain who stole a mysterious chemical, but unexpectedly, the villain ruptures the chemical pouch inserted in his crotch, triggering a transformation into Granis—zombie-like creatures. The Granis rapidly spread through the forest and attack Cosmo Angel, attempting to drain her energy. With help from Professor Yomizaka, she manages to escape into a research facility. However, she soon discovers the professor has laid a cunning trap—she is overpowered by the Granis, raped, and her energy is forcibly extracted. As the professor intended, the Granis merge together and evolve into the ultimate lifeform, Asmodai. Can Cosmo Angel defeat this overwhelming being? Ultimately, her fate—and everything else—lies entirely in the hands of the professor's master plan.