Kivotos is a federal megalopolis made up of thousands of schools and governed by the General Student Council (GSC). Ironically, despite its status as an academy city, Kivotos is plagued by gun violence, with all students carrying firearms as a routine part of daily life. Compounding the crisis in Kivotos, the GSC president has vanished without a trace. Fortunately, prior to her sudden disappearance, the GSC president recruited Sensei—a teacher who is likely the only one in Kivotos—to aid students during their time of need. Sensei’s initial step is to support Abydos High School, a formerly prestigious academy that now has only five enrolled students. These remaining students are striving to pay off their school’s crushing debt of nearly one billion yen.