That Time I Got Reincarnated as a Slime Season 4 Targets the Top: Japan TV Ratings Revealed
Television animation ratings for the week of March 30 to April 5, 2026, in Japan have been released, and one of the biggest players of the spring season, That Time I Got Reincarnated as a Slime (Tensei Shitara Slime Datta Ken), made a swift entry into the list at 4th place with its Season 4 premiere. Produced by studio 8bit and adapted from Fuse's popular light novel series, the production managed to keep viewers glued to their screens with the first episode of the new season. For a seasonal anime to achieve such high success at the top of a list usually dominated by family series proves once again the series' unshakable popularity in Japan.
Familiar names stand out in the rest of the list. The legendary series One Piece maintains its consistency by placing 6th on the list with its thrilling episodes, while Ascendance of a Bookworm (Honzuki no Gekokujou) Part 3 settled into 7th place, continuing to be a favorite among book lovers. The increase in visual quality of the new episodes of Ascendance of a Bookworm, now handled by WIT Studio, plays a major role in the series' success in the ratings. Myne's struggle on the path to printing and establishing a library continues to attract both its established fan base and new viewers.
The success of the That Time I Got Reincarnated as a Slime series is no coincidence. Its anime journey, which began in 2018, follows Rimuru Tempest as he is reincarnated as a slime and builds a vast nation. Following the political developments and alliances formed in Season 3, Season 4 is expected to cover "The Seven Days Clergy" and the critical events that follow. Fans are eagerly waiting to see how Rimuru will solidify his power as a Demon Lord and what the new role of the Tempest Federation will be on the world stage. Previous seasons of the series also consistently stayed in the top 10 of the ratings lists during their broadcast periods.
TV ratings in Japan are generally based on household viewership in the Kanto region. A series like Slime placing 4th among giants that air every week, such as Sazae-san and Detective Conan, demonstrates the current strength of the anime industry. Competition is expected to heat up in the coming weeks as other ambitious productions of the new season join the list. We will see together how long Rimuru and his friends will remain in this race for the top. Who do you think will be the ratings champion of this season?
