Mayu Suzuki lives with her husband and his parents. By chance, she discovers that her father-in-law was her former high school teacher, a man she once deeply admired and respected. As she devotes herself to his caregiving, tenderly supporting his frail body and warming his heart and soul, her feelings begin to shift beyond mere reverence, awakening hidden physical desires. As her emotions deepen, a new intimacy emerges between them, forging a bond unlike anything they've ever known.