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. 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...