Hai Shinigami to Fushi no Neko is a Manga/Manhwa/Manhua in (English/Raw) language, MONSTERS series, english chapters have been translated and you can read them here. You are reading Hai Shinigami to Fushi no Neko chapters on ManhwaZ, fastest updating comic site. The Summary is
The maritime nation "Republic of Enetia" where the plague "black disease" has begun to spread. In this country, there was a "state affairs assassin" who executed a felony, commonly known as an assassin of justice.