Living with his three younger sisters in a home without parents, Haruo Yoshikawa is a typical middle-schooler with a humble goal of living a long life. Little does he know, his sisters possess magical powers and he may also have some hidden within himself. Suddenly, Ayumi Mamiya enters the scene, a gorgeous girl with her own magical abilities whose mission is to transform Haruo into a man capable of breaking a childhood curse. To achieve this, she takes the job of a maid at their house. Despite being popular with the male students, Ayumi is despised by Kurusou Yuri, a strict and organized class president who has been in love with Haruo since they were kids.
