Located somewhere in Tokyo, a popular 12-story apartment building with 77 units, built five years ago and just a 7-minute walk from the nearest station. Equipped with modern amenities like auto-lock doors and parcel boxes, its 1K units rent for around 70,000 yen. A man working for the company managing this property harbors impure desires. He begins sneaking into the apartments of female residents late at night. Using a small camera, he secretly watches them through grainy footage. A woman in a business suit enters her room, briefly disappears from view, then reappears holding a plastic bottle. Suddenly overcome by drowsiness she can't explain, she loses consciousness without understanding why and collapses to the floor.