A 24-year-old named Azusa who works as an administrative assistant at a general trading company. Today, she misses the last train at a company drinking party. She tempts her 40-something department head, who she's had a crush on for a while. Pretending to be weak, she says, 'I'm a little tired...' and they enter a love hotel. As soon as they're alone, they engage in a passionate kiss. She teases him as he calls his wife, and rents a camera as an option at the hotel. Azusa, emboldened by alcohol, decides to record their intimate moments alone. The excitement accelerates as she is filmed. This is definitely a secret that the two of them can't tell his wife.
