Shibuya 6th Undead Defense Unit is a Manga/Manhwa/Manhua in english language, Action 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

One day, the world ended. Mysterious creatures appeared, turning modern Japan to ruins. As humanity hid underground to survive, an organization formed to protect them and reclaim the surface. Its name was:the "Undead Defense Unit."