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Not to be confused with Adult comics (成年漫画, also read as "seinen manga").

Seinen manga (青年漫画^?) is a subset of manga that is generally targeted at a 20–30 year old male audience, but the audience can be older with some comics aimed at businessmen well into their 40s. In Japanese, the word Seinen means "young man" or "young men" and is not suggestive of sexual matters. The female equivalent to seinen manga is josei manga. It has a wide variety of art styles and more variation in subject matter, ranging from the avant-garde to the pornographic. Seinen manga is distinguished from shōnen, or boys' manga, by having a stronger emphasis on realism. Because of the emphasis on storyline and character development instead of action, some seinen series are often confused with shōjo, or girls' manga.^{[citation needed]} This is especially true of seinen comedy series such as Chobits, and Chi's sweet home, or seinen drama such as Twin Spica. Other examples of seinen manga include: Gantz, Battle Royale, 20th Century Boys, Naoki Urasawa's Monster, Blame!, Ghost in the Shell, Akira, Berserk and Battle Angel Alita.

A common way to tell if a manga is seinen is by looking at whether or not furigana is used over the original kanji text: if there are furigana on all kanji, the title is generally aimed at a younger audience. The title of the magazine it was published in is also an important indicator. Usually Japanese manga magazines with the word "young" in the title (Young Jump for instance) are seinen. Other popular seinen manga magazines include Ultra Jump, Afternoon, and Big Comic.