Manga (漫画) comes from Japan. Digital, web manga porn, made an influence on adult manhua in China and manhwa18 in Korea, but in both visual style and story, ero manga (エロ漫画) is completely different. It is more traditional, closer to Japanese culture – for example, it is mostly black-and-white. Hentai manga (H Manga) shares themes with hentai, like tentacle sex, futanari, yaoi, yuri… – this makes manga18 unique.
Online adult manga (成人漫画) spread across the Internet all over the world, became part of the erotic webtoons wave.