草食系なサキュバスだけど、えっちなレッスンしてくれますか?

Kusaka Kouichi is a high-school student with an ero mangaka as his older sister. He lead a pretty ordinary life until summer vacation hit and he found out that his childhood friend, Mia was a succubus. Not only a succubus, she was inexperienced and would be in deep trouble if not trained. As time dragged on, more and more people around Kusaka turned out to be clueless succubi. Now begins the quest to teach them all the ways of the succubus!