5. Sasameki Koto (Whispered Words)

Unlike the previous two series, Sasemeki Koto is unabashedly yuri. The main characters in the series are all pretty much self-identified lesbians, aside from the one recurring male (but possibly gender-variant) character.

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http://roygbiv.jezebel.com/these-are-the-seven-best-lesbian-anime-series-ever-made-1634542445/+andrasneltz