Anime

I Became a Black Gal So I Fucked My Best Friend; Kuro Gal ni Natta kara Shinyuu to Yattemita (黒ギャルになったから親友としてみた, Kuro-Gyaru ni Natta Kara Shinyū to Shite Mita) is Japanese Anime series which is based on the Manga Written by Yupopo Orishima.

Synopsis
Shion and Rui are the dream team when it comes to hitting on women. Tonight was going to be another night of hooking up with girls for Shion, but he ended up taking a strange drug. When he woke up... he'd turned into a girl?! Rui came looking for Shion, but didn't recognize him, and started hitting on him...