In short
- English: sexually explicit manga and anime. Japanese: sexual perversion.
- The Oxford English Dictionary added the genre sense in March 2011.
- Hentai manga comes as collected volumes, magazine chapters and self-published doujinshi.
- Licensed English stores sell uncensored editions; Japanese platforms require mosaics.
Hentai meaning in Japanese and in English
The two languages use the word differently. Anime News Network's lexicon: In Japanese "Hentai" refers strictly to sexual perversion. However in North America this word has been adopted and is used to refer to pornographic Anime.
In Japan the same material is called ero, or poruno for animation.
The English sense made it into the Oxford English Dictionary in March 2011, defined as a subgenre of the Japanese genres of manga and anime, characterized by overtly sexualized characters and sexually explicit images and plots
, from a Japanese word meaning literally "abnormal, perverted".

How platforms use the word
English-language stores use "hentai" as a shelf label, since that is what readers search for. FAKKU, which licenses Japanese adult manga and doujinshi in English, describes its Unlimited catalog as completely uncensored English hentai comics
. Irodori Comics licenses doujinshi directly from the artists and sells them as uncensored PDFs. On SubscribeStar, artists tag their pages #Hentai.
Some platforms use the word to draw a line. GlobalComix, a general comics platform, says explicitly sexual stories (such as Hentai)
are not accepted. Japanese platforms such as pixiv, pixivFANBOX and Fantia allow R-18 work but require mosaics on all of it, so the uncensored question comes up constantly (see why hentai is censored).
Hentai, ecchi and porn comics
Ecchi is the milder word: sexual humor without outright pornography. "Porn comics" in English search usually means western-style work, and the overlap with hentai is covered on porn comics vs hentai. For where to read, see hentai manga, the uncensored hentai sites list, or the rest of the glossary.
FAQ
Does hentai mean the same thing in Japan?
No. In Japanese it means perversion and is not the normal genre name. Japanese stores label explicit work as adult or ero.
Is hentai only anime?
No. The OED definition covers both manga and anime, and most legal English hentai sold is manga and doujinshi.
Can I read hentai for free legally?
Some, yes. FAKKU gives away a weekly free title, and Irodori Comics has about 14 artist-approved free titles. Our free hentai manga page lists the rest.