Keita, a thirty-year-old security guard who spends his days gambling and drifting without purpose, receives a postcard from a grandfather he has never met saying that there is something to be passed on. Expecting an inheritance, he travels to a forgotten mining village covered with tropical plants. Through life with his grandfather and memories of the Pacific War, Keita's life begins to move.

A postcard from a grandfather he has never met leads Keita to a forgotten mining village.