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

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 climax 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 sex with a magical girl, he will die!? A tale of the rise of an introverted, unpopular virgin and a doggy-style-obsessed fairy!