Super pet peeve:
Bland descriptions.
"In which (insert super boring thing)" uninteresting!
"In which yin, a u.a student is just trying to survive unknowingly making every important character fall for her." Is that just the plot? Boring!
It's just bad practice, that's all. If you want people to read your story, the description is the thing you have to prioritize for first impressions.
If you're going to have a bland description atleast make your cover or title interesting...
Tbh "in which" is slowly starting to get into my nerves abit