History Of Manga-Shōnen,seinen,andseijin manga (1) :- Manga for male readers can be characterized in different ways. One is by the age of its intended audience: boys up to 18 years old ( shōnen manga) and young men 18- to 30-years old ( seinen manga). Another approach is by content, including action-adventure often involving male heroes, slapstick humor, themes of honor, and sometimes explicit sexuality. Japanese uses different kanji for two closely allied meanings of "seinen for "youth, young man" and for "adult, majority" the second referring to sexually overt manga aimed at grown men and also calledseijin("adult") manga. Shōnen, seinen, andseijin manga share many features in common. Boys and young men were among the earliest readers of manga after World War II. From the 1950s on, shōnen manga focused on topics thought to interest the arche typical boy: sci-tech subjects like robots and space travel, and heroic action-adventure. Shōnen and seinen manga narratives often portray challenges to the protagonist’s abilities, skills, and maturity, stressing self-perfection, austere self-discipline, sacrifice in the cause of duty, and honorable service to society, community, family, and friends. Manga with solitary costumed superheroes like Superman, Batman, and Spider-Man did not become popular as ashōnengenre. An exception is Kia Asamiya's Batman: Child of Dreams, released in the U.S. by DC Comicsand in Japan by Kodansha. However, lone heroes occur in Takao Saito's Golgo 13 and Koike and Kojima's Lone Wolf and Cub.Golgo 13 is about an assassin who puts his skills to the service of world peace and other social goals, and Ogami Itto, the swords man-hero of Lone Wolf and Cub, is a widower caring for his son Daigoro while he seeks vengeance against his wife's murderers. However, Golgo and Itto remain men throughout and neither hero ever displays superpowers. Instead, these stories "journey into the hearts and minds of men" by remaining on the plane of human psychology and motivation. Many shōnen manga have science fictionand technology themes. Early examples in the robot subgenre included Tezuka’s Astro Boy and Fujiko F. Fujio’s 1969 Doraemon, about a robot cat and the boy he lives with, which was aimed at younger boys. The robot theme evolved extensively, from Mitsuteru Yokoyama's 1956 Tetsujin 28-goto later, more complex stories where the protagonist must not only defeat enemies, but learn to master himself and cooperate with the mecha he controls. Thus, in Neon Genesis Evangelionby Yoshiyuki Sadamoto, Shinji struggles against the enemy and against his father, and in Vision of Escaflowneby Katsu Aki, Van not only makes war against Dornkirk’s empire but must deal with his complex feelings for Hitomi, the heroine.