No sooner than Melida returns to Flandore, she’s encouraged to enter the Vibria Goat Librarian Certification Exam, which in addition to being a damn mouthful, involves exploring Flandore’s sprawling central labyrinth library. Melida and Elise are eligible owing to their status as Luna Cadets, but the headmistress just wants them to stay on the safest level and get the feel of the place for a future exam.
Meanwhile, a widespread conspiracy is in motion against the Angel family, whose political rivals are annoyed that a girl of dubious parentage continues to rise. The movement is led by Salacha’s older brother, and she and Mule flank him as he discusses how they’ll take the Angels down. Mule even offers a magical book to aid them, which begs the question: whose side are these girls on? Salacha’s hesitation over harming Melida seems to suggest the answer isn’t so simple.
Salacha’s brother’s first move is to send in a goofy joker-masked man into Melida’s school to loudly and publicly declare he, not Lord Angel, is her real father. While examining her mana, Kufa reminds Melida that he warned her this kind of thing would happen when she started to gain renown, and to simply keep facing forward and doing her best.
Despite the headmistress’ meager expectations, Kufa thinks Melida should try to win the Certification Exam, in order to silence further doubters of her potential and prove that even if she is technically a bastard, she has what it takes to serve Flandore with distinction. So of course, things don’t go as planned when the Exam begins, with the lift being interrupted and a strange tentacle monster snatching up only Melida and Elise.
As the two girls battle high-level undead—apparently the ghosts of past librarians, very Ghostbusters—in the sprawling library, Lord Angel himself visits her school, and is received by Kufa and Rosetti. After the incident with the impostor claiming to be her father, the Lord’s fears about Melida’s fast rise causing trouble for the family has led him to decide to pull her out of school—away from both Kufa and Elise.
Kufa protests, and the Lord can tell he has reason to, but the dispute is interrupted by a message from Guild Grimface, indicating that Melida and Elise are in grave danger. Back in the library labyrinth, just two undead enemies cause severe wear to the girls’ swords, making it unlikely they’ll last if more than two were to appear. Naturally, ten ghosts appear, surrounding them, which is when Salacha and Mule drop in and eliminate them.
Is Salacha here to carry out her brother’s wishes and those of the families who have allied against the Angels? Is Mule seriously going to take steps to expose Melida’s “blunders”? Or are they there as they were at the slumber party: fast friends who want to protect and aid them?