Plot Summary: When someone dies, what should their final words be? Words that couldn't be said while still alive - of love, hate, hope, regret or perhaps words without any importance. These words are sent through letters called "shigofumi" from the recently deceased to the living. Mikawa Fumika is a mail carrier of these shigofumi, delivering them alongside staff and her partner Kanaka. However, there must be something more behind Fumika's silent exterior; shigofumi mail carriers are deceased humans with the same appearance they had just before death. Despite this, Fumika is still aging...