Lesson of Darkness

Injuh Kateikyoushi (Lesson of Darkness) is a 1996 Hentai OAV.

Tropes

 * Bob Haircut: Azusa.
 * Body Horror
 * Death by Sex: With the exception of Miho, this happens to Azusa and any other girl who gets raped by Inoue.
 * Deus Sex Machina
 * Downer Ending: Happens after the end credits.
 * Cool Shades
 * Hypnotic Eyes: Mr. Inoue uses this on Miho to get the blue dark stone from her.
 * Mars Needs Women
 * Mate or Die: The sex beasts purpose for the survival of their race. However, Inoue is an exception to this.
 * Modesty Bedsheet: Azusa after having sex with Mr. Inoue.
 * Naughty Tentacles
 * Panty Shot