Shinji is a shut-in whose sole purpose in life is to peek into the window opposite. The married woman living in the room opposite is beautiful, and Shinji is fascinated by her beautiful buttocks that sway when she changes clothes without any protection. Then, one day, Shinji realizes. She is Nao, a classmate he had a crush on when he was a student... He never imagined he was peeking at his classmate's naked body and private life... Shinji's desire grows even more. At that time, Shinji drops his shoes that were hanging out to dry on the balcony, and Nao picks them up and comes to visit his house without knowing anything about it...