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Class S (クラスS), also known as esu kankei (エス関係) and abbreviated as S or esu (エス), is a social practice that emerged in early 20th century Japan of intimate romantic friendships between school-aged girls. The term is also used to designate a literary genre of works that depict this practice.

Etymology
"Class S" is a wasei-eigo (Japanese-made English) term

History
The history of Class S is closely linked to the history of female education in Japan. The country entered a process of modernization at the beginning of the Meiji era in 1868, and in 1872 elementary school became compulsory for boys and girls.