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.

Ramune is visited by Kengo, a young man whose penis has turned into a chikuwa fish cake. Though there must be some reason for it, Kengo refuses to talk. When Kengo begs Ramune to fix it, even if it's only temporary, Ramune hands him a certain mysterious item. Kengo accepts the item and begins talking to a woman named Yui about going on a date, but...