Sora Kashiwagi is just a regular high school kid until he gets a mummy from his dad. A mummy, not a mommy like he requested. Now he cries himself to sleep wishing he had a real mom like the rest of his classmates. Instead of being fed home cooked meals he must now take care of an invalid creature from horror cinema. He quickly must learn How to Keep a Mummy.
Daichi Taira is your average high school freshman. When his parents are just about to go abroad, he stays behind to finish high school with his friends. Before departing, his parents share some surprising news: His first crush and childhood friend, Sosogu Hoshifuri, is moving back to his neighborhood. And she'll be going to his high school! It's been five years since they last met. And to Daichi's surprise, Sosogu moonlights as the center of a popular guerilla school idol group. But even more surprising, Sosogu is his fiance! How will this love drama play out? Find out in Hoshiiro Girldrop!