My answer might not be accurate. Mighty Face is usually a condition in which a person is overly fascinated or concerned about the appearance or characteristics of others and may show feelings of anxiety, jealousy, or inferiority. In this novel, the male protagonist may suffer from a special kind of facial confusion that only affects women. This may be due to his excessive fascination with the appearance of certain women or the resonance of certain female behaviors or words. But I'm not sure if this description fits the plot of the novel. If I have more information, I can try to answer your question more accurately.