Unlike Ecchi, which features mild sexual themes, hentai contains graphic depictions of sexual acts and is intended exclusively for adult audiences. It’s pornographic in the strictest sense.
The term hentai relates to the phrase “pervert”, which is a perfect description of the material you can expect to see in a hentai series.
Family friendly, Wholesome, Clean, Pure, SFW (safe for work).
History:
The history of hentai goes back to the Edo period of Japan, and a lot of the laws that were put into place carry over today.
So technically, hentai began as an erotic art called “Shunga” during the 16th to 19th century. Though hentai flourished as we know it during the 1980s and 1990s, specifically.