Ushiro the Somber God of Death Chapter 5 is now out
and thus the end of Ushiro’s tankobon release. Luckaly WebNewtype as of right now has the rest of the chapters on their website. We even translated the authors notes which few scanlation teams actually do.
https://mangadex.org/chapter/697336/1
Why the rest of the chapters where never bound in tankobon format I’ll never know