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Susumu Nakoshi is a homeless man with a past as a highly successful financial investor. Mysterious and cynical, he maintains a detached attitude toward everyone, even other homeless people. He is, however, morbidly attached to his compact car, which he now uses as a shelter. When the vehicle is confiscated by the police, he agrees to a generous proposal from Manabu Ito, an eccentric medical student fascinated by the occult and looking for a subject for a delicate experiment: trepanation.
Despite expectations and conducted tests, the procedure does not grant the patient the anticipated abilities. However, Susumu discovers that when he observes people using only his left eye, the appearance of some of them seems strangely altered.
Analyzing the phenomenon, the two understand that Susumu is capable of seeing the physical manifestation of the unconscious—the “homunculi”: the essence of people and the projection of guilt, obsessions, insecurities, and other psychological aspects that influence their behavior and actions.
This newfound faculty leads the misanthropic protagonist to reconnect with others. By helping complete strangers confront their inner worlds—often with dramatic and unpredictable consequences—he discovers that what he perceives in others reflects a kind of mirror of his own self. This awareness destabilizes him emotionally and psychologically, guiding him through the challenging journey toward greater self-knowledge, culminating in a difficult confrontation with the past from which he had fled.