After her parents' death, sixteen-year-old Fumino Kaji has bounced between relatives' homes with her little brother Teppei and decides to quit school and support him herself. Her homeroom teacher, Kazuma Ojiro, finds her on a park bench and, when she blurts out that someone should just marry her and take them both in, agrees to do exactly that. Now secretly a teacher's wife, Fumino has to keep the marriage hidden from school, where exposure would cost Kazuma his job.