An anthology comic of Re:Zero kara Hajimeru Isekai Seikatsu by various mangaka.

A story about a miracle, involving Fumika, a quiet but hard working girl who wears a uniform of a mail carrier, and her talkative staff and partner Kanaka. The Shigofumi is a posthumous letter, the last resort of relaying a deceased person\`s last message to his/her loved ones: family, friends, and significant other. (Source: AniDB)