Tsubomi, assigned to the general affairs department, becomes entangled in an unexpected secret. In this department, a special operation is conducted to relieve male employees suffering from extreme fatigue due to long overtime hours and grueling workloads. This operation, known as "sexual stress relief," forces Tsubomi into service. She is mounted onto various restraints designed for public sexual use—such as rear-entry and front-entry public toilet woman devices—and subjected to repeated creampie ejaculations by numerous male coworkers. Gradually, Tsubomi is compelled to accept her body as nothing more than a tool for their release. Removed from all sense of normal life, she faces impossible choices and an inevitable, degrading fate.