One more volume of our protagonist's desperate struggle not to stand out, which she's failing miserably at; whether it's due to being hilariously overpowered, prone to panicking and acting without thinking, or making moves nobody else can predict or even understand because she's playing checkers when others are playing 3D chess. Also, it doesn't help that she, just like everybody else, is a bit of an idiot.
This volume takes a while to get going, but when it does, it's good - it's a silly, chaoic story where people's quirks run into one another at full speed, somebody is constantly getting dissed, all the great plans turn out to have glaring flaws but often work better than the originals, and no matter what happens, Mary becomes even more of a legend. The silly chaos is also the greatest weakness of its style - don't expect deep characters or meaningful story, or even things to make sense with anything but a cursory reading. This is no Tearmoon; things mostly just happen for the fun of it.
A big caveat, though: A large part of the plot this time, I'm sorry to say, is a cursed sex change artifact. It's not handled in a mean way, as boys being feminine often is in LNs, but it's also dealt with all the subtlety and nuance you'd expect a random light novel to have, which is to say, none. There are some interesting ideas there (The queen believing that as a future king, the prince having a personal experience with what woman's life is like is a boon to him and the kingdom both), but they're buried pretty deep.
Favourite character: It's a tie between Alice who finds all undead things cute, and Victorica who's the oldest and mightiest vampire with the personality of an easily distracted little kid. A close runner-up, the hydra with the speech patterns of an annoyed teenage girl.
Favourite moment: Repeatedly using Turn Undead on a vampire as a la la la can't hear you :D