Sawaki, a postman, has lived a quiet life. One day while making his daily rounds, he runs into Noguchi, an old friend who has become a drug dealer. Into Sawaki's bag, Noguchi sneaks a package of drugs and also, inadvertently, a finger severed by his yakuza bosses in retaliation for a botched job. That evening, when reading from his stash of undelivered letters, Sawaki learns of a young woman, Sayoko, who is dying of cancer. Fascinated by this stranger's tragedy, he rushes to her side. In the process, Sawaki befriends a professional hit man, Joe, who is close to Sayoko. En route to meet his new friends and fulfill his promise to Sayoko, Sawaki is unaware that he is suspected of murder and in dire peril.