A teen disaster comedy about 3 girls who failed the grade.After spending nearly a year as a shut-in, Koto enters first year of high school for the second time.Together with fellow repeating students Shiki (held back due to poor health) and Tomoe (held back due to excessive free-spiritedness), as well as the expectation-immune, habitually late grade retention reserve army cadet Kaede, her experience of school life is rather different from the norm, but delightful in its own way.