The story is after the first season, but before the second. Can be watched after the 23rd (before last) or after the 24th (last) episode of the first season as the story is technically a continuation of a part in the 23rd episode. This is a very short story put into two episodes in which Rimuru makes the golem he promised to Ramiris after destroying her guardian golem. If you wish to see what exactly Rimuru does and how the golem is created (as it wasn't really explained in the main story) then take a look and see for yourself. The art style is the same as the original,so are the animations and voice actors. Characters do not feel out of place nor do they do things which they normally wouldn't do. In my opinion, this story is more for those who wish to see more of "Slime Anime" than for those who are just here to watch the main story and move on.

Sukuwareru Ramiris consists of 2 short episodes of 2 minutes each that feel like scenes they forgot to put in the anime somehow. The episodes happen in the middle of the 23rd episode of the first season of "That time I reincarnated as a slime" and can be watched at any point after the 23rd episode. In these episodes it is shown how Rimuru creates a golem for Ramiris. The significance of this is pretty minor but the golem will play a role in the second season and these two mini episodes get explicitly mentioned in a flashback which is pretty confusing if you haven'twatched them. The animation, voice acting and sound are all the exact same as in the main anime. Overall I'd definitely recommend watching this to anyone who likes "That time I reincarnated as a slime" and especially to people who just finished the first season so that they won't be confused about the origin of the golem.