ALIENS AREA is a Manga/Manhwa/Manhua in english language, SCI-FI series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Tokyo, Planet Earth... High schooler Tatsumi Tatsunami lost his parents at a young age and now works multiple part-time jobs to live a hectic but peaceful life with his younger siblings. One day his body undergoes a sudden change... And now mysterious beings are showing up at his house! In order to protect the people he holds dear, in order to protect Earth (or "area"), Tatsumi must awaken! He better, because "they" are already here!