Injû kyôshi V - jissha-ban aka Angel of Darkness V (1996) - Atsushi Shimizu

Quote:
College life getting you down?
Switch to Seika College where the students are getting a whole
new lesson in sexual education! Michiru’s classes were dull and
boring until her classmates, Chie, Saori and Takeru, started
taking extra classes at a new night school. Utilizing subliminal
messaging, the school helps their students ace their daytime
college exams. Unfortunately, the school's professor forgot to
mention the process has a few sexual side effects...

Injû kyôshi II aka Angel of Darkness 2 (1995) - Atsushi Shimizu

Quote:
Sealed away for eons, the egg from an Injuu,
a lusty demon tentacle, manages to escape its earthly
confinement when an earthquake shatters its prison
into tiny bits. Mad as hell (not to mention sexually
frustrated after being incarcerated for all those years)
it’s out to get revenge!