It looks like you’re referencing the OVA series — specifically episodes 1–5, possibly with an “A-D” or “with...” note (maybe referring to audio options, fansub groups, or file naming).
As the series moves into the middle chapters, the "Gedou" (heretical/immoral) aspect takes center stage. Characters who were once pillars of morality find themselves trapped in situations designed to strip away their dignity and autonomy. Gedou gakuen -Nightmare Campus- 1-5 -A-D- -with...
For collectors and historians of adult media, the 1-5 -A-D- collections represent the definitive way to experience this particular era of the genre. These releases often come with supplemental materials that provide insight into the production, such as art galleries or voice actor interviews, which were common for high-profile releases of that time. "Gedou Gakuen" (Nightmare Campus) It looks like you’re
: The "Nightmare Campus" setting is defined by supernatural gang violence and unholy appetites as different demonic entities fight for control of the school. Dark Horror Elements For collectors and historians of adult media, the
: Demons from the broken seal in the Himalayas relocate to Earth and inhabit human hosts on campus, including Masao’s friends. The King of the Underworld : Masao is bound to the soul of
The notation “1-5 -A-D-” refers to how the episodes were originally packaged in Japan:
Gedou Gakuen , widely known by its Western title Nightmare Campus