That Time I Got Reincarnated as a Slime Season 4 Ranks No. 1 in Japan’s Summer 2026 Anime Streaming Rankings, Beating Mushoku Tensei and Re:Zero

That Time I Got Reincarnated as a Slime Season 4 has emerged as Japan’s top-ranked anime in a newly published Summer 2026 streaming ranking, finishing well ahead of fellow isekai heavyweights Mushoku Tensei: Jobless Reincarnation and Re:Zero − Starting Life in Another World. The results highlight the continued popularity of established fantasy franchises during a season packed with returning series and new adaptations. According to a report published by Japanese entertainment company XING Inc. through PR Times, the ranking was…