Soushokukei na Succubus dakedo, Ecchi na Lesson shite Kuremasu ka?

Kusaku Kouichi is a highschooler who is somewhat uncomfortable with the eros due to his older sister being a manga artist for erotic mangas. Aside from being dragged into the whims of his free-spirited sister, he led a pretty average lifestyle until the summer break of his second year in highschool, when his life met its turning point. He found out that his childhood friend, Mia was actually a succubus who did not know her stuff, and that she would be in deep trouble if he does not teach her how to do the dirty deeds. Furthermore, in a twist of fate, all the girls around Kouichi were clueless succubuses similar to Mia—The erotic love comedy of “teaching” his harem starts now!