The Ways of the Monster Nation

That Time I Got Reincarnated as a Slime: How the Monster Country Works 「転生したらスライムだった件～魔物の国の歩き方～ Tensei Shitara Slime Datta Ken: Mamono no Kuni no Arukikata」 is a side story manga series held chronologically after the main story's Tenma War Arc. In it, we explore how the Monster Country Tempest works and thrives through the eyes of the Rabbitman (Lycanthrope) Flavia as she is given special privileges for being hired by Rimuru to test out and rate/review various aspects of the country in hopes of giving the public an honest advertisement from a consumer's point of view.

Trivia

 * Alternate Translations include "The Ways of Strolling in the Demon Country" and "How Monsters Walk", it actually refers to how the Monster Country Tempest is thriving and advancing. In other words, how Tempest works/functions as a country.
 * The breakdown of the title is "Monsters' " (魔物の Mamono no) "Country's" (国の Kuni no) "Way/Method of Walking" (歩き方 Arukikata) referring to how it "works/thrives/advances/progresses". In other words "How the Monster Country Works".