For Shutaro, peeping into the apartment across the hall was his only joy in life. The married woman living there, unaware of his gaze, would reveal her beautiful, carefree body—her big ass swaying as she changed clothes—completely captivating him. One day, he makes a shocking discovery: the woman is none other than Nao Jinguji, his high school crush from years ago. Realizing that all her naked moments and private routines have been on display for him sends his desire spiraling out of control. Then one day, Shutaro drops a shoe from his balcony, and Nao picks it up, innocently coming to his door to return it. This chance encounter will change his life forever.