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Komaki Nagai, a 31-year-old single mother, divorces her irresponsible husband and returns to her family home in Tokyo’s Sumida ward with her young daughter, Noriko, nicknamed Non-chan. Struggling to find work, Komaki leans on her talent for making nori bento, which she prepares lovingly for Noriko and shares with neighbors. Her delicious bentos earn praise, inspiring her to consider opening a bento shop. While working part-time at a local diner, she encounters the skilled owner, Toya, whose cooking captivates her, prompting her to become his apprentice. Komaki’s journey unfolds with vibrant energy as she navigates financial hardship and builds a new life in the warm, nostalgic downtown community.