Gorgeous, heart-throbbing beauty—two stunning women appear! Their true identities: covert special investigators. Infiltrating the infamous and mysterious Satan Academy disguised as a female teacher and a female student, they work to uncover its dark secrets. But suddenly, an incident occurs! To rescue a student kidnapped by a corrupt teacher, they transform into "Moretsu Mask Phoenix & Fairy" and rush into battle. Amid the chaos, they discover the tragic fate of another "Moretsu Mask"—captured and defeated by the Human Chair. Knowing this secret is too dangerous! The two heroines are ultimately defeated in combat against the academy's principal. Their beautiful bodies become ravenous prey for the Human Chair, and they are seized by the principal himself. Reduced to sexual slaves, their cries of maddening orgasms echo endlessly across the school grounds… [BAD END]