After some convincing, Olivia is permitted to become the King’s Pupil without having to leave school. But before her appointment has time to settle, news comes in that the plant she wrote about for her summer project was confirmed to be the plant-acea, long thought extinct. Her first mission as the King’s Pupil is to investigate the location where she found it. However, when Olivia and her classmates return to Mount Olympias to find more of it, things aren’t as they should be. A dark, foreboding aura has settled over the mountain, and there are monsters everywhere! Her priority quickly shifts to finding out exactly what has happened to her home.

Meanwhile, news of Olivia’s discovery of the plant-acea has begun to spread, and a certain unsavory individual has taken notice of Olivia’s fame...