In 1976, when she was only 26 years old, Keiko Takemiya began a comic series that proved to be a ground-breaking moment for Japanese manga. Called Kaze to Kino Uta (The Poem of Wind and Trees), it opens with two naked teenage boys in a 19th Century French boarding school lying on top of each other, post-coital.

 

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Source: http://www.bbc.com/news/world-asia-35714067