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...
(Source: Suiseisha, translated)
Background
Kuro Gal ni Natta kara Shinyuu to Yattemita. has been published digitally in English as Fucked by My Best Friend by WWWave Corporation through various digital platforms.