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Warm and bittersweet, a temporary life under the same roof. Ui is a third-year high schooler cramming for exams who ends up moving in with distant relatives: a kind grandmother and her grandson Rintaro, a first-year who acts cool but is secretly a grandma's boy. As they live together, something warm stirs in Ui's heart. Meanwhile, Rintaro finds himself increasingly caught up in Ui and her carefree ways...!?