The third cour of That Time I Got Reincarnated as a Slime season 4 will begin in July 2027.
The September 25 announcement on the official Tensura website also confirmed an April 2027 premiere for the spin-off anime Clayman’s Revenge. Viewers will therefore get Clayman’s own story before the main series resumes its fourth season.
Season 4 continues with its third cour
The July return is part of season 4, rather than a fifth season. A cour is a broadcast block lasting roughly three months. “Cour 3” therefore means the season’s third broadcast block, not its third episode.
July 2027 is the announced Japanese broadcast window. This announcement does not specify an exact premiere date, an episode count for the new block or an international release schedule. Subtitled availability in Vietnam requires separate confirmation from the distributor.
Clayman’s spin-off premieres in April 2027
Clayman’s Revenge adapts the manga spin-off of the same name and places the Demon Lord who opposed Rimuru at the center of the story. Eight Bit handles the animation, and Takehito Koyasu returns as Clayman. It is a separate anime, rather than the title of season 4’s next broadcast block.
In his message accompanying the announcement, author Fuse described a comic idea behind the spin-off. Clayman sternly reprimands his subordinates, only to spill wine on his white suit and try to conceal his embarrassment. The example suggests a story that also explores the awkwardness beneath his imposing manner, rather than simply continuing his familiar role as an antagonist.
The two projects have a special collaboration video featuring new footage made by Eight Bit. Further announcements can be followed on the official Clayman’s Revenge anime page.
Sources: The official Tensura website’s September 25, 2026 announcements of the season 4 and spin-off broadcast windows and staff, cast and creator messages.
