Was that description not obvious enough? Wiki says: generally marketed towards young teen males between the ages of 12 and 18…. The kanji characters (少年, shōnen) literally mean “boy” or “youth”, and the characters (漫画, manga) means “comic”; thus, the complete phrase means “young person’s comic”, or simply “boys’ comic….characterized by high-action, often humorous plots featuring male protagonists. Commonly-found themes in shōnen manga include martial arts, robots, science fiction, sports, horror or mythological creatures. The camaraderie between boys or men on sports teams, and fighting squads are often emphasized. Protagonists often feature a desire to better themselves, often facing challenges to their abilities, skills and maturity. Values such as self-perfection, self-discipline, sacrifice and honorable service to society, community, family and friends are often stressed.