Kyosei Tensei is a Manga/Manhwa/Manhua in english language, Adult 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

Anezaki Satoru, a Genius had his childhood friend murdered and r@@ped, he then tracks down her 15 killers and he murder$ them, he then gets sentenced to death for his crimes of murder, after being executed though, he found himself in a parallel apocalyptic world...