At Tennomifune Academy, students with "negative karma"-the kids who are practically weighed down by misfortune-are all collected into one place: Class 1-7. On the first day of school, Ruri Hibarigaoka (Hibari) meets fellow 1-7 classmates Anne Hanakoizumi (Hanako), a girl up to her ears in bad luck, and the all-too-frail Botan Kumegawa (...Botan). These fast friends just want to have a fun high school life, but are they pushing their luck...?!