H manga and hentai are terms that often get thrown around interchangeably, but they do have nuanced differences. H manga, short for 'Hentai manga,' refers to sexually explicit manga that originated in Japan. These stories can range from softcore to hardcore content, but they often include a narrative structure, character development, and sometimes even romantic or comedic elements. The art style tends to be more detailed, and the focus isn't solely on the sexual acts but also on the story surrounding them.
Hentai, on the other hand, is a broader term that encompasses all forms of explicit adult anime and manga. While H manga is a subset of hentai, hentai itself can include animated series, OVAs, and doujinshi (self-published works). Hentai often prioritizes the sexual content over storytelling, with less emphasis on plot or character depth. The term 'hentai' is also more commonly used outside Japan, whereas 'H manga' is more specific to the manga format. Personally, I find H manga more engaging when I want a blend of story and adult content, while hentai is my go-to for purely visual gratification.