Makutsu no Ou ~Yomei Ikkagetsu no Doutei, Mahou Shoujo Harem o Kizuite Ou e Kunrinsu~ 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

After being transported to another world and wandering a forest inhabited by monsters, Shimizu Shouichi's life is saved by a cute fairy called Ami. He is given the skills to survive in the other world, but in exchange, he has to make a girl coom once a month or he will die! Shouichi, who has no experience with women, is hesitant at first, but Ami's skillful conversation skills lead him to become honest about the desires hidden deep within his heart... If he doesn't have $3X with a magical girl, he will die!? A tale of the rise of an introverted, unpopular v!rgin and a d00ggy-style-obsessed fairy!