Tsui no Taimashi ―Ender Geisterー is a Manga/Manhwa/Manhua in (English/Raw) language, SUGGESTIVE 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

This protagonist, the most demonically strong exorcist. Akira the S-class exorcist sent from Germany to investigate a paranormal event in a certain city in Japan. He shoots creatures from other worlds with his beautiful exorcist partner Chikage.