For generations, the Bernstein family has been recognized as a house of nobles who favor books over everything else. Elianna Bernstein, daughter of a baron of the Sauslind Kingdom, is no different. But instead of being called a bookworm, she is known as the Bibliophile Princess. Four years ago, the crown prince, Christopher Selkirk Asherald, offered Elianna a special arrangement: if she would become his fiancée, he promised that she could continue to spend all her free time reading. Despite having to inherit a title of great responsibility, she agreed to the proposal, enticed by the prospect of gaining access to the royal archives housing a wide selection of books. To this day, Elianna firmly believes that her engagement is void of romantic sentiment. When she notices Christopher's interactions with another girl, she presumes that the days she spends with him will soon reach an end. Yet, during this period of uncertainty, Elianna and Christopher open a new chapter in their relationship, gradually uncovering their genuine feelings as they grow to better understand each other.

High school girl duo Popuko and Pipimi are back and more unhinged than ever after their initial efforts to create a full-fledged anime production were met with a great reception. With no regard for their audience, they continue to live their reckless everyday lives consisting of comedy skits and parodies of epic proportions. No one is immune to the effects of their antics—including hapless live actor Shouta Aoi, who is on the run and stuck trying to be a hero in the wrong series.

Among the royal court, there is an individual feared as much as revered: the Raven Consort Ryuu Jusetsu. Residing in her jet-black palace and isolated from the emperor, she is the subject of countless rumors. Claimed to possess mystic abilities, she is said to take on any request—from finding lost items to inflicting curses. While some call her an immortal sage, others believe her to be a terrifying revenant. But such comments fail to faze Jusetsu, who prefers to spend her days in quiet solitude. That is, until the emperor, Ka Koushun, barges into her court and asks for her assistance with a mysterious case. The young emperor's request requires Jusetsu to step out of her palace for the first time. Despite Ka Koushun's frequent visits annoying her to no end, she cannot bring herself to turn him away. Her predecessor's teachings echo in her ears: the Raven Consort is destined to remain forever alone and never desire anything. Yet Jusetsu finds herself making the first of several bonds when she asks Jiujiu, an innocently inquisitive court girl, to be her sole attendant. Together, they begin fulfilling requests from the people of the palace. However, unknown perils lurk in the outside world, and drawing attention to herself may bring Jusetsu face-to-face with a past that is better left undisturbed.

Among all the beasts that roam the world, there are unique types of "ultimate species" that harbor immense strength and magical prowess considered to be at the top of the power scale. As such, many humans covet their abilities, leading some of these species to the brink of extinction. As a beast tamer, Rein Shroud can employ the assistance of various animals for many tasks, such as reconnaissance and logistics. By virtue of his ability, he joins a party led by the vile and manipulative hero Arios Orlando, only to be banished after six months due to his uselessness as a non-combative class. However, unbeknownst to the team that cast him away, Rein is an exception among beast tamers. His potential becomes apparent when he meets Kanade—a cat spirit who is also one of the ultimate species—and is able to form a contract with her. With Kanade by his side, Rein sets out on his journey as an adventurer, steadily rising up the ranks and meeting more ultimate species along the way.