In Japan of 20XX, robot technology has advanced dramatically, and android nurses have begun actively serving in medical fields. These androids possess advanced medical capabilities, such as emitting X-rays from their eyes to perform radiography and analyzing urine components instantly by ingesting patient urine. Furthermore, they actively participate in treating Human Erectile Dysfunction Syndrome (HED) and severe mental illnesses, supporting patient recovery. At maintenance facilities, male androids repair and modify female androids, while simultaneously conducting procedures to impart the sensation of sexual pleasure to these emotionless androids. The story portrays the evolution of androids straddling the boundary between technology and humanity.