Suginami, Public Servant and Eliminator - The People on Dungeon Duty 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

A Japan where monster-filled other worlds - dungeons - are simply normal. Public servants known as the "Capture Division" are in charge of dealing with them! Yuunagi Yuuma, a newbie eliminator who longs to be a hero, pairs up with his dispassionate yet surprisingly caring senpai Yonaga- and heads out to his 9-to-5 job subjugating other worlds!