Ayami Kawaguchi is a 17-year-old high school student. Her family runs a tofu shop where the tofu is made with local spring water. She is a member of her high school's kyudo club, but she doesn't do well there. One day, Ayami delivers tofu to a local sake brewery. There, she finds the owner of the sake brewery, Shozo Sugita, collapsed and he is sent to hospital. Afterwards, Ayami Kawaguchi gets involved in a dispute over the water source succession.

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