most popular manga magazine among this demographic, placing ahead of magazines that specifically target a female readership. The target group orientation of manga is particularly evident in the non-manga content of manga magazines, which include advertising and articles on topics tailored to the interests of young males, such as video games. Non-manga content often corresponds to a major manga series in a given magazine, for example, advertisements for a video game adaptation of the series, or articles about an animated film adaptation of the series. History Pre-war and wartime era Children's magazines with sex-segregated readerships have existed in Japan since the early 1900s. While early youth magazines were ostensibly unisex – Shōnen Sekai was the first youth magazine in Japan in 1895, targeting a readership of both boys and girls – in practice, the editorial content of these publications largely concerned topics that were thought to be of interest to boys. This provoked the emergence of first exclusively (girls) magazines in 1902, and magazines subsequently began to exclusively target a male audience. Initially, these magazines did not publish manga; the first magazine to do so was Shōnen Pakku, first published in 1907. This was followed by Shōnen Club in 1914 and later Yōnen Club. Among the most successful and influential manga series in these early magazines were Norakuro by Suihō Tagawa, which follows the life of an anthropomorphic dog soldier, and Tank Tankuro by Gajo Sakamoto, about a robot-like character who can change his appearance. magazine enjoyed significant popularity during the 1920s and 1930s, with Yōnen Club selling over 950,000 copies. During the Second Sino-Japanese War and Second World War, magazine sales declined and publications were used increasingly for wartime propaganda purposes. The manga content in these publications was reduced, and the series that remained typically focused on patriotic and militaristic themes, such as stories about samurai. In other stories, robots were depicted as fighting in the war against the Allied forces, as analogous to western superhero comics that depicted superheroes fighting the Axis powers during this same period. Post-war era During the post-war occupation of Japan, the Japanese publishing industry was rebuilt under initially strict guidelines. Stories focused on war, combat, and most competitive sports were banned with the aim of discouraging belligerence and hindering the use of manga for pro-Imperial propaganda. Manga developed during this period under the influence of artist Osamu Tezuka, with series such as Astro