 Shunrō Oshikawa invented the "adventure manga" genre, with his works being published many times in both "Shōnen Sekai" and "Shōnen Club" and compiled into tankōbon format.In the middle of the Sino-Japanese War "Shōnen Sekai" featured many stories based on war, or acts of bravery upon war.After the Sino-Japanese War, "Shōjo Sekai" was created as a sister magazine geared towards the female audience.