Watch That Time I Got Reincarnated as a Slime Season 1 Episode 21 full movie online free in HD with English subtitles – no download needed.
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.