At the Semen Hospital, a unique facility operates under a dual mission of medical care and adult entertainment, driven by a spirit of service. Patients are individuals suffering from health issues caused by excessive semen intake, and nurses perform an unusual "suction treatment" involving fellatio to extract semen. This treatment also includes facial ejaculation, deepening the hospital's dark secrets. As Miyu grows suspicious and begins her own investigation, she becomes entangled in a conspiracy by the Semen Foundation to addict all women to semen. The sight of Miyu noisily gulping down semen symbolizes the hospital's twisted daily routine.