[After secretly filming the tennis club's older sister for four years, their forbidden relationship begins once the affair is exposed.]

The forbidden impulses of adolescence often spiral out of control in an unexpected moment. The protagonist of the story is a tall, energetic tennis club girl who is used to a "naked" lifestyle at home, unguardedly displaying her perfect figure sculpted through years of exercise. Meanwhile, her younger brother secretly sets up a camera and films her for four whole years.

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Four years of secret footage accumulated countless heart-pounding moments. Until that day, the older sister discovered the hidden camera, and anger and shock froze in the air. However, at the height of this confrontation, the younger brother mustered the courage to utter the words he had long held back—and the situation took a sharp turn for the worse, heading in a direction no one had anticipated.

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This story is so captivating precisely because it perfectly blends the innocent impulsiveness of adolescence, the tense confrontation after being discovered, and the secret sweetness unique to a forbidden relationship. The older sister's tall figure in the tennis club intertwines with the tense emotional threads, constructing a forbidden story that will hold your breath and keep you watching until the very end. Where will this secret hidden under the family roof lead?