Onna no ikutoki nozokareta chitai (1999)

Koji, a former engineer fired after being implicated in a confidential data leak, turned to a sordid line of work to survive: secret filming. He would sneak into the homes of women living alone, plant cameras, and sell the footage to enthusiasts. Just as he had settled into this lifestyle, he ran into Yuka—his former subordinate and ex-girlfriend. After planting a camera in her apartment, he began to uncover the truth behind the data leak and the reality of Yuka’s true self...