Manga- History And Characteristics (2):- Modern shōjo manga romance features love as a major theme set into emotionally intense narratives of self-realization. With the superheroines, shōjo manga saw releases such as Pink Hanamori's Mermaid Melody Pichi Pichi Pitch Reiko Yoshida's Tokyo Mew Mew, And, Naoko Takeuchi's Pretty Soldier Sailor Moon, which became internationally popular in both manga and anime formats. Groups (or sentais) of girls working together have also been popular within this genre. Like Lucia, Hanon, and Rina singing together, and Sailor Moon, Sailor Mercury, Sailor Mars, Sailor Jupiter, and Sailor Venus working together. Manga for male readers sub-divides according to the age of its intended readership: boys up to 18 years old (shōnen manga) and young men 18- to 30-years old ( seinen manga); as well as by content, including action-adventure often involving male heroes, slapstick humor, themes of honor, and sometimes explicit sexuality. The Japanese use 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, and seijin manga share many features in common. Boys and young men became some of the earliest readers of manga after World War II. From the 1950s on, shōnen manga focused on topics thought to interest the archetypal boy, including subjects like robots, space-travel, and heroic action-adventure. Popular themes include science fiction, technology, sports, and supernatural settings. Manga with solitary costumed superheroes like Superman, Batman, and Spider-Man generally did not become as popular. The role of girls and women in manga produced for male readers has evolved considerably over time to include those featuring single pretty girls ( bishōjo) such as Bell dandy from Oh My Goddess!, stories where such girls and women surround the hero, as in Negima and Hanaukyo Maid Team, or groups of heavily armed female warriors (sentō bishōjo) With the relaxation of censorship in Japan in the 1990s, a wide variety of explicit sexual themes appeared in manga intended for male readers, and correspondingly occur in English translations. However, in 2010 the Tokyo Metropolitan Government passed a bill to restrict harmful content. The gekiga style of drawing—emotionally dark, often starkly realistic, sometimes very violent—focuses on the day-in, day-out grim realities of life, often drawn in gritty and unpretty fashions. Gekiga such as Sampei Shirato's 1959–1962 Chronicles of a Ninja's Military Accomplishments (Ninja Bugeichō) arose in the late 1950s and 1960s partly from left-wing student and working-class political activism and partly from the aesthetic dissatisfaction of young manga artists like Yoshihiro Tatsumiwith existing manga.