The monarch of Slantania has formally named Sei Takanashi the Holy Saint—a powerful girl summoned from another realm to rescue the land. After enduring months of nonstop battles with monsters, Sei now can unwind and resume her research at the Medicinal Flora Institute. While her romance with Albert Hawke, commander of the Third Knight Order, slowly deepens, her single status draws unwanted suitors—much to Albert's frustration.
In addition, Tenyuu—a prince from the distant Zaidera Empire—has shown keen interest in Slantania and its potent restorative elixirs. Since Sei's true identity is a state secret, she must keep a low profile within the palace until Tenyuu has explored the institute and returns home. Though he appears unremarkable, the foreign prince is anything but ignorant. He has arrived in Slantania with a specific purpose, and Sei's extraordinary abilities might hold the key to his enigmatic investigation.
