[Classic Literature Crossover] Causing Trouble in the Early 19th Century

Warning: The protagonists both transmigrate. It's very indulgent, very indulgent, extremely indulgent!!! If that's not your thing, please move along!

The male and female leads are childhood friends, as close as sisters (or brothers). They know each other's embarrassing pasts and aren't interested in each other. Each will find a partner in a shared universe of classic novels. So far, it includes Pride and Prejudice, Sense and Sensibility, The Adventures of Sherlock Holmes, The Phantom of the Opera, and Perfume. This is not quick transmigration; it's a mixed bag, and canon couples will be broken up.

Theme: Transmigrating to stir up trouble.