Fumika and Kanaka are mail carriers- but not the typical kind. For one, Kanaka is a talking staff and for two, Fumika delivers shigofumi: letters from the dead addressed to the living. These letters are a final, true, communication derived from hate, hope, and love. The story unfolds following this pair and their uncommon job as well as Fumika's unique 'situation'.
boy: Tegami? [Letter?]
Fumika: Shigofumi. Shigo no sekai kara tegami. Dakara shigofumi. [Death Letter. A letter from the afterlife. Therefore: death letter.]