That Time I Got Reincarnated as a Slime takes the isekai formula and swaps the adventure for administration. A salaryman dies, wakes up as the weakest monster in the game, and rather than becoming a hero he founds a country.

That's the reason it stands out. Most of the series is diplomacy, infrastructure, trade agreements and monster naming rights. Rimuru's power is absorbing abilities, which means the interesting question is never whether he can win a fight - it's whether he can convince two hostile species to share a road.

The naming mechanic is a genuinely good piece of worldbuilding. Giving a monster a name evolves it and binds it to you, so Rimuru's nation grows through an act that is simultaneously generous and strategic.

Shuna, Shion and the ogre retainers give the series its warmth, and the show is unusually good at making a growing cast feel like a household rather than a roster.

This collection covers Rimuru and Shuna.