Suginami City Magical Girls' Academy, a school exclusively for girls with magic powers. While it has grades from elementary through high school, Shinohara Kaede is transferring in as a first-year high school student. Under the school's "sisters" system, Peacekeeping Club president Kiritani Mai is assigned as Kaede's "older sister," tasked with guiding the newcomer. Kaede ends up joining the Peacekeeping Club, which is essentially a hangout for students who aren't doing well in school. Original Webcomic