Tensei Shitara Warui Kuni no Musume Deshita Tensei Shitara Waruiko o Deshita is a Manga/Manhwa/Manhua in english language, REINCARNATION series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

A boy is resurrected as a demon girl in a parallel universe, where he's forced to fight against none other than his own childhood friend, who herself has sworn to wipe out every last demon in the realm.