Tensei shitara Slime Datta Ken 3rd Season: Kanwa - Diablo Nikki

Diablo records the events that followed Rimuru's rise as a true Demon Lord and Clayman's defeat. After Walpurgis, his master's influence extends across the Great Forest of Jura, and Tempest prepares to receive representatives from many peoples while Rimuru works to present his nation not as a land of frightening monsters, but as a country others can live and trade with.

To Diablo, every one of Rimuru's achievements is further proof of his master's greatness, even when the circumstances are more complicated than he cares to admit. Looking back over battles, alliances, and decisions that shaped this new stage for Tempest, he arranges the past in the way only Diablo could: as an admiring record of how Rimuru reached the point of presenting his power and ideals to the wider world.