A mysterious man who calls himself, the Guardian, tells a boy that he is a spirit who has been given a second chance at life in the body of Min, a teenager who recently committed suicide. The Guardian tells him that he has 100 days to discover the reason for Min's death, or die permanently. The spirit gradually adjusts to Min's life, and begins to feel comfortable, but as his relationship with Pi develops and he attempts to delve into Min's past, he discovers the many problems he had with his family and friends. He realizes why Min would want to leave this life, and tells the Guardian that all of them contributed to Min's suicide, but the answer was rejected, wasting his only chance...