That Time I Got Reincarnated as a Slime: Trinity in Tempest manga volume 6 is based on the work by Fuse and features story and art by Tae Tono with additional illustrations by Mitz Vah.

Wielding her new equipment, Phos joins the battle with the Demon Lord Clayman alongside a grand alliance of the Tempest Federation and the beast kingdom Eurazania. Meanwhile, aware of Milim's secret plan to declare war on Carrion, Stella rushes to the City of the Forgotten Dragon, and Nemu heads for the harpy kingdom of Fulbrosia, where they work diligently to prepare. The trinity plan to reunite in Eurazania, on the battlefield... Don't miss the climactic struggle between nations, retold from the new, ground-level perspective of three valiant warriors!