Nokoshi Susumu has worked previously in a top foreign financial company but now, he is a 34-year-old homeless, unemployed man who lives in a car and hangs out aimlessly in a park in Shinjuku. One day, he meets Ito Manabu, a medical school student, who offers him 700,000 yen in exchange for volunteering to undergo an illegal surgical procedure known as trepanation. The procedure involves drilling a hole into the skull in an attempt to improve brain functions to the point of bringing out a person's sixth sense. After the operation, Susumu wakes up with a strange power that changes human's appearance into a distorted manifestation when he closes his right eye and sees a person with his left eye. He then learns that the distorted appearance is a representation of people's subconscious minds and starts interacting with those people who possess a dark side. ~~ Adapted from the manga series "Homunculus" (ホムンクルス) by Yamamoto Hideo.