199X-The era of the borderline when the bubble economy is over and the Heisei recession is about to enter. There was still a "half dong" at school, a half-day class on Saturday. Maho Takano, a second-year junior high school student, had a secret pleasure on Saturday of such a "half-don". It's about sneaking into her kitchen and making her own lunch. Moderate noise, soothing silence, and a sense of immorality were addictive. However, such a happy time suddenly ends-- !?