People become afflicted by "mysterious diseases" when their hearts and minds are affected by "the mysterious."
Koto, a girl who produces mayonnaise from her eyes, visits Dr. Ramune, who specializes in these diseases that can't be explained by modern medicine.
She was brought to the clinic by Ramune's apprentice Kuro.
Koto explains that she also cries condiments other than mayonnaise, and Ramune offers her a mysterious treatment.
They say joy, anger, grief, and pleasure 
are the basic human emotions.
يقال أنّ الفرح والغضب والحزن 
.والمتعة هي مشاعر الإنسان الأساسيّة
Das sind doch die vier
grundlegenden Emotionen!
Dicono che gioia, rabbia, tristezza e allegria 
sono le emozioni umane primarie.
Dizem que os sentimentos básicos
são alegria, ira, tristeza e deleite.
Говорят, что это базовые
человеческие эмоции.