Lead: Official Tensura Season 4 Part 3 plans locked July 2027, while the Clayman’s Revenge spinoff TV anime was set for an April 2027 debut on the same Friday staff dump.
On September 25, 2026, the That Time I Got Reincarnated as a Slime (Tensei Shitara Slime Datta Ken) team published a dual schedule hit on the official Tensura site: Season 4’s third cours returns in July 2027, and the Clayman’s Revenge (Clayman REVENGE) spinoff manga is getting its own television anime from April 2027. Anime News Network’s English wire the same day matches those months and fills in studio and cast detail for the spinoff.
What happened
The official Tensura news post dated 2026-09-25 states, in plain terms, that TV anime Season 4’s third cours will broadcast in July 2027, and that Clayman REVENGE will air as a TV anime beginning April 2027. The same post points to a collaboration special video pairing Season 4 with the spinoff, described as new footage from studio 8-Bit.
ANN reports that Season 4 is planned as a five-cours run, with the first two cours airing continuously after the April 3, 2026 Japanese debut on NTV’s Friday Anime Night block (BS11 and streaming followed). Crunchyroll is streaming the main series as it airs. 8-Bit remains on Season 4, and Miho Okasaki continues as Rimuru Tempest.
For Clayman’s Revenge, ANN lists Kentarō Sugimoto directing at 8-Bit, Yūji Haibara overseeing series scripts, and Asumi Hashimoto plus Hideki Sakai on character design. Takehito Koyasu returns as Clayman. Wataru Kajika’s spinoff manga launched in April 2022; Kodansha’s K MANGA carries it in English digitally, and the ninth compiled volume shipped August 7 (per ANN). The premise, as carried in English manga marketing quoted by ANN, reframes Clayman after the Walpurgis Festival rather than treating him as a closed villain beat.
Why Tensura Season 4 Part 3 matters
Five cours is a rare television commitment in the current isekai market. Locking Part 3 for July 2027 tells international viewers the mainline show is not pausing into an indefinite “cour gap rumor” cycle—it has a named return month. Pairing that with an April 2027 Clayman series gives the franchise two 2027 entry points: a villain-centric side door in spring, then the main Season 4 continuation in summer.
That structure is useful for readers who follow adaptation pacing. Clayman’s arc is one of the franchise’s most quoted ensemble stretches; a dedicated show lets 8-Bit and Koyasu sit with marionette-master material without forcing every beat through Rimuru’s viewpoint. For HowDrawManga’s audience, more 8-Bit key art and Clayman-focused stills also means a steadier reference stream than a single cours dump.
What we know vs what is rumored
- Confirmed: Season 4 third cours in July 2027; Clayman’s Revenge TV anime from April 2027; Season 4 planned as five cours with continuous first two cours; 8-Bit on both projects named in coverage; Koyasu returning as Clayman; Sugimoto / Haibara / Hashimoto / Sakai credits on the spinoff; official collab PV from 8-Bit (official Tensura site; Anime News Network).
- Unconfirmed: exact premiere calendar days inside April and July 2027, Clayman episode count, whether Clayman’s Revenge shares Crunchyroll’s day-and-date pattern with Season 4 outside Japan, and how much of Kajika’s manga the first cour will cover.
What happens next
Watch ten-sura.com and the Season 4 / Clayman committee channels for locked broadcast weeks, key visuals, and streaming territory lists. Crunchyroll’s Tensura hub remains the practical English schedule board for Season 4; treat unsourced “Part 3 canceled” or fake episode totals as noise until staff or the official site posts a correction.
Sources: Official Tensura — Season 4 Part 3 & Clayman REVENGE broadcast decision; Anime News Network — Tensura Season 4 Part 3 July 2027, Clayman’s Revenge April 2027