Doesn't really feel like an end, but it is a chibi slice-of-life spin-off, so expecting closure might be too much.
I very much enjoyed it. Not every chapter was interesting, but it was great to see more from characters who were neglected in the main story (like Sherry and Marie). The only thing to compain about is how this series completely ignored Zeta and Eta. Maybe it was because they only had their first proper appearances in LN volume 5, so the mangaka of this series had no material to work with?