If you can’t wait for the next chapters it’s showing for free to shorts anime
https://www.crunchyroll.com/ascendance-of-a-bookworm/ascendance-of-a-bookworm-side-story-one-eustachiuss-incognito-operation-downtown-794244
That is 14.5p1 and right after is 14.5p2 📔. Availability for free users: Mar 16, 2020 until Jun 22, 2020
Also free is chapter 13 and 14