This was a super charming show. I enjoyed the characters with all their eccentricities. Any type of over-arching plot is basically non-existent, but having an awkward, shut-in elf, who got reverse-isekai'd to Japan 600 years ago teach you history lessons about Japan during various periods from the past because she was there as a bystander is a nice little premise + having other elfs pop up here and there too is a great addition. I can't say that I found many of the random facts about history that she imparts to be too interesting personally, but there were a few I went, "huh, that's kindaneat." The bits where Elda and Koito bond overly something silly like eating Monja were probably my favorite; there's a sentimentality to this series stemming from Elda's immortal, unchanging nature and seeing the ones you love grow older and die before your eyes that's similar to the vibe you get in Frieren and Maquia, but it didn't overshadow the comedy bits. All-in-all, recommend checking this one out.