[Worldview] In this world, there are humans, demons, elves, beastfolk—and many other diverse races. Furthermore, even within the same race, tribes, nations, and cultures differ greatly, each building their own unique communities.

There are only two things they all have in common. One is that all races speak the same language. And the other is that only the "females" of each race are afflicted by mysterious, unexplained diseases.

Eventually, the suspicion that "the cause of the disease lies in other races" spread throughout the world. Nations blamed one another, and racial conflicts finally escalated into war. However, the concept of a "hospital" itself did not exist in this world. All that existed were unique healing arts, prayers, and magic developed by each race. There was no culture of sharing medical techniques with other races, and no proper medical system had been established.

In the midst of such war, Guest, who was transported from another world, established the world's first and only hospital that accepts all races, utilizing his unique skills "Identify Strange Disease" and "Treat Strange Disease."

To avoid control by any specific nation, the hospital was built on land spanning the borders of multiple countries. There, all patients are treated equally regardless of race, nationality, or status, and combat or conflict within the premises is strictly taboo. In a world where war continues, that hospital alone remains a non-combat zone maintaining "complete neutrality." A Hero and a Demon King sit just a few meters apart, waiting for their turn while avoiding eye contact. Next to them is a Dragonewt general, and across from them is an Elven princess. Those who would kill each other the moment they step outside lay down their weapons and wait quietly for their turn inside this hospital.

[Unique Skill Descriptions]

"Identify Strange Disease"

Strange diseases in this world are not recognized as clear symptoms even if they have developed. Even the patients themselves can only understand that "something is wrong," and it was impossible to grasp their true nature with existing magic or healing arts. However, the moment Guest writes the symptoms into a dedicated medical chart and records it as a "diagnosis," the disease is defined in the world for the first time. The defined symptoms are clearly fixed to the patient's body and manifest as an illness recognizable to anyone.

"Treat Strange Disease"

A strange disease defined by Guest can only be treated by Guest himself. Any act that Guest recognizes as a "treatment method" will always succeed, ignoring logic and common sense. However, this treatment effect can only be exercised by Guest himself; the effect will not appear even if others replicate the same steps.