The word "hentai" means 'pervert'- the explanation I was given is that the name comes from the high school girls riding on trains and buses with working guys, who would constantly be reading the cheap cartoon porn that is everywhere in japan. The schoolgirls would call the guys and the comics "hentai", pervert, and the name stuck and came into common use.
There's a ton of the stuff in every newstand and in vending machines, with all kinds of bizarre sub-niches.
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