Harumi Kou confesses to his childhood friend Aiko but she rejects him. His older sister Akane and younger sister Touka try and comfort him when they suddenly get an idea. They'll have Kou run for student council and make him popular to get Aiko to like him but they take their idea too far and start building him a harem? With themselves included? Classmates, teachers, foreign exchange students from America? How many girls will Kou have?