Mai Sugiyama manages operations in a corporate office environment. She commands professional respect from colleagues due to her management expertise. Her physical presence, marked by a voluptuous figure, attracts significant attention within the workplace.

Mai initiates a clandestine affair with Ono, a new intern already involved with colleague Rie. This affair commences during late-night overtime encounters at the office. It subsequently develops into a complex dynamic where Mai manipulates existing office relationships.

Sugiyama orchestrates a celebration party that culminates in a foursome orgy involving Ono and two other employees. This incident directly causes the destruction of Ono's relationship with Rie once discovered. Mai Sugiyama's narrative role centers on exploring workplace power dynamics and their repercussions.