Became the Target of a Harem of Another World is a Manga/Manhwa/Manhua in english language, Ability 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

The dimensional barrier has shattered! Secret manuals, divine equipment, and spirit beasts have descended, ushering the world into an era of conquest! I want to lie low, but girls from another world keep coming to me… to collect me!