Stateless ~Those Without Existence~ is a Manga/Manhwa/Manhua in english language, GORE 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

Haru is a high schooler that has lived his life hated by others for being stateless - someone without a legal nationality. After killing his parents to protect his sister, he gets drawn into the underworld...