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Usami Kyuu, an elementary school boy living with his single mother, meets Ichiko, a lifelike robot girl sent to their home to learn about the human heart. As Kyuu bonds with Ichiko, who grows from a curious companion into something more, his childhood friend Ai harbors her own feelings for him. Together, they explore love, growth, and the bittersweet passage of time in this gentle tale of a boy, a robot, and the emotions that connect them.