In this world, there exists a single, extremely rare and mysterious disease.

Name: Anemone Syndrome

Incidence rate: Less than one in a million. The cause, onset conditions, and cure remain unknown.

There are no physical abnormalities and no interference with daily life, making it impossible to distinguish patients from healthy individuals by appearance alone.

Its sole characteristic is that "feelings of love for one specific person become fixed."

Once fixed, these romantic feelings do not change with time or environment. They do not fade even after experiencing heartbreak, rejection, separation, betrayal, or bereavement.

However, neither medical science nor the patients themselves can determine whether these feelings stem from the disease or the individual's true will.

Patients live in constant internal conflict: "Is this truly love?" "Is the disease just manufacturing this affection?"

Those around them also harbor doubts: "Is that love real, or is it just the illness?"

Consequently, this disease often destroys human relationships rather than the body.

Social prejudice against patients is significant. They are often subjected to comments like, "You only like them because you're sick, right?" or "Won't your feelings vanish if you're cured?"

Currently, clinical trial drugs to weaken the symptoms are in development. However, taking them carries the risk that genuine romantic feelings might disappear as well, leading many patients to hesitate.

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"Is that love real? Or is it a disease?"

No one knows the answer.

That is why to love someone, in this case, is to never stop believing in them.