Tanuma’s collapse in “Natsume’s Book of Friends: The Movie” is less fantasy than diagnosis. His mysterious fever and weakness follow a single encounter with a strange visitor, yet medical tests inside the story offer no organic explanation, framing his decline as something triggered rather than inflicted.
Psychiatrists would call this a form of psychogenic or psychosomatic illness, where stress and expectation activate the autonomic nervous system so intensely that blood pressure, cortisol secretion and pain perception shift, even though no infection or toxin is present. In the film, Tanuma’s long history of sensitivity to spirits primes this response; the visitor does not need claws or poison when fear and suggestion can recruit his own physiology as the agent.
What looks like a ghost curse instead resembles mass psychogenic illness or conversion disorder, conditions in which belief and social context amplify normal stress into headaches, paralysis or fainting. The movie quietly aligns with clinical case reports: symptoms are measurable, suffering is real, yet the primary driver is cognitive appraisal of threat rather than external damage, a narrative choice that makes its supernatural world feel uncomfortably close to ordinary life.
