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After losing her parents and witnessing her once-kind older brother change drastically, young Kanami feels isolated and longs for the warmth of family she once knew. In a desperate attempt to fill the void, she decides to "rent" a big brother, Makoto, through an unusual service. What begins as a transaction for companionship soon becomes a source of unexpected comfort and connection. As Kanami navigates her complex feelings toward her real brother and her "rental" one, she discovers the power of chosen bonds and the healing that comes from understanding.