That Time I Got Reincarnated as a Slime: The Ways of the Monster Nation manga volume 1 features story by Fuse and art by Sho Okagiri and Mitz Vah.

The Jura-Tempest Federation is a vast melting pot of monsters from all walks of life, and they're finally making waves in the wider world around them. Their leader, Rimuru, decides it's time to compile a Tempest guidebook-and there's no one better for the job than a local rabbitfolk girl with a knack for travel reviews! Follow her adventures in this unique That Time I Got Reincarnated As a Slime spin-off where you'll see the sights and learn the customs of this massive monster nation!