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Shiharu Nakamura, a high school girl living in an orphanage, works part-time at a daycare where she cares for two-year-old twins, Akane and Aoi Matsunaga. Seiji Matsunaga, the twins’ uncle and a busy TV announcer, notices their strong attachment to Shiharu and hires her as their babysitter, offering double her daycare wages. Shiharu, who dreams of running her own daycare, accepts the job to support her expenses and gain experience. She grows close to the twins, relying on memories of her mother’s kindness to guide her caregiving. The daily interactions between Shiharu, the twins, and Seiji build a warm, makeshift family dynamic.