Haida, once a famous private detective, is now down and out and running out of reasons to live. One day, while engaging in a group volunteer project to clean up a river, he loses what's left of his will to live and lets the water carry him away. He ends up rescuing a drowning man who alters his view of life totally. Soon he gets a job investigating the mysterious disappearance of a student who sent her mother a cryptic letter, "Wait a bit, Mother. I'm sending my breath. It will arrive soon."

Two yakuza, one of whom frequently reflects on an uncomfortable past taking advantage of Korean women, meet a stowaway on Japanese soil from across the Genkai Sea.

A couple years have passed, Matsuzaki is divorced and has a daughter and is still up to his old compulsive gambling, boozing and womanizing even as he stares middle age in the face. At his daughter's school he meets a teacher who's similarily obsessed with horserace betting and who's also frigid - something he does his best to therapize. He also reconnects with his ex-wife, who just so happens to be the literary agent and love interest of another writer of the gambling genre. An epic gambling battle between the two ensues.

At the end of WWII, Japanese doctor Akagi searches for the cure for hepatitis in the prisoner-of-war camp.