TenSura Season 4 Is the Biggest Slime Has Ever Been and That Is Saying Something

Every previous season of TenSura ran 24 episodes. Season 4 is planned for approximately 60. That alone tells you this is not a standard continuation.

The announcement came at the end of Season 3 in September 2024. Season 4 would premiere April 3, 2026, structured across five cours, with the first two airing back to back from April through September without a break. Release dates for the remaining three cours have not been confirmed yet. What that structure signals is that Studio 8bit and the production team are treating this as a definitive, extended adaptation rather than another incremental season.

Where the Story Is Now

The Jura-Tempest Federation that Rimuru spent three seasons building has reached a new phase. The Founder's Festival has been held, diplomatic relations with multiple nations are established, and the dream of a world where humans and monsters coexist is no longer a vague goal but an active project called the Human-Monster Coexistence Sphere. Tempest functions. It thrives. Rimuru's nation is real and growing.

Season 4 opens in that relative peace, which for anyone familiar with how TenSura works is exactly when things get dangerous. In the shadows of Tempest's rise, factions who view Demon Lord Rimuru as an existential threat are moving. The political stability built across three seasons is now the thing that needs defending, and the threats against it operate on a scale that previous arcs did not reach.

The dungeon storyline also advances early in the season. Episode two focuses on the dungeon evolving and Team Lightspeed attempting its deeper floors, which feeds into the broader expansion of Tempest's power and territory.

What the Production Looks Like

Studio 8bit returns for the fourth consecutive season. Naokatsu Tsuda directs, taking over from Atsushi Nakayama who handled previous entries. Miho Okasaki reprises her role as Rimuru. The opening theme is performed by Eir Aoi, titled Esoragoto, and the ending theme Katsubō is performed by CiON.

A second film also released in February 2026, serving as a narrative bridge between Season 3 and Season 4. It is non-canon but fills in the gap between the two seasons tonally and adds context for where several characters stand going into the new arc. Watching it before starting Season 4 is worth the time.

Where to Watch

Season 4 streams weekly on Crunchyroll every Friday. The first two cours run straight through to September 2026, meaning there are no mid-season gaps for the initial run. For a series that often made viewers wait a year between seasons, that uninterrupted stretch is a genuine change.

If you have been watching since 2018 and held on through every season, Season 4 is the payoff for that patience. If you have never started TenSura, three seasons and a film is the homework before this one lands.