That Time I Got Reincarnated as a Slime - Full Series Information, Trailer & IMDb Reviews
Watch That Time I Got Reincarnated as a Slime Season 1 Episode 21 online. Maybe available on Youtube, Netflix, PrimeVideo, Hulu, Disney and other legal streaming platforms.
Rimuru becomes the new teacher for Shizu's students. However, having been summoned into this world against their will and facing shortened lifespans as a result, the children's feelings are complicated, and they're reluctant to accept Rimuru. So Rimuru proposes a series of mock battles with each of them to ascertain their abilities and allow them to let offsteam.