Shinyaku Ookami Ga Kuru!

From Aerandria Scans:
(Prequel}
In order to investigate the strange phenomenon occuring in Northern Bavaria (Franken), Germany, the church (Kirche) have dispatched the slayer Sirius. He rescues a young woman, Beate, who was being attacked by zombies. However, as the two attempt to leave, they’re attacked by more zombies…
{Sequel}
This series is the continuation of Ookami ga Kuru! In order to investigate the strange phenomenon occurring in Northern Bayern, Germany, the church (KIRCHE) have dispatched the slayer Sirius. He rescues a young woman, Beate, who was being attacked by zombies. However, as the two attempt to leave, they’re attacked by more zombies.
Note: Chapter 8 and below is the prequel while chapters after 8 are the chapters of the sequel series