Two years ago, Yuka married her current husband, but recently he has been frequently traveling for work, leaving her home alone for long periods. As a result, she has been spending more time with her stepson, Atsushi, and their relationship has gradually grown closer. One day, Yuka discovers in Atsushi's room the video camera he mentioned buying with his part-time job earnings. When she checks it, she finds footage casually recorded—containing images of herself...