The provided chapters introduce Prince Harsherik Glacis, the seventh prince of the Glacis Kingdom, who is the reincarnation of Hayakawa Ryoko, a 34-year-old office worker and otaku. Despite his royal lineage, Harsherik is characterized as a "disappointing prince" with no talent for sports or magic, possessing only average looks among royalty. His personality is a facade of gentleness hiding stubbornness, coupled with an inability to ignore those in need. His primary motivation is to save his kingdom from ruin, utilizing his past life's administrative and otaku skills.
His father, King Solye Glacis, is the 23rd monarch, appearing as a young man with platinum blonde hair and blue eyes. Originally a third prince, he ascended to the throne due to unforeseen circumstances. Solye is kind, humble, and perceptive, but ill-suited for kingship, prioritizing family over royal duties, leading to his reputation as a foolish ruler. He is secretly highly capable in both magic and swordsmanship. The kingdom is effectively controlled by Marquis Barbass, a powerful minister who manipulates the king for personal gain.
A significant event involves Count Luzelia, a lord of the kingdom's frontier. After his family was assassinated by Barbass's faction, disguised as an accident, Luzelia sought revenge and tried to address the kingdom's decline. He presented his case directly to King Solye during a banquet hosted by Harsherik. However, this backfired, leading to his arrest for treason and subsequent execution. Before his death, Luzelia entrusted Harsherik with information about the kingdom's state and a pocket watch, which Harsherik now possesses.
The narrative also introduces Schwarz, nicknamed Kuro, a mysterious and skilled former spy from the "Shadow Fang" organization. Kuro is a black-haired, red-eyed individual with exceptional combat and information-gathering abilities. He is aloof and ruthless, but fiercely loyal to Harsherik, whom he serves as a butler. Luke, the king's chief butler and Solye's childhood friend, is a loyal retainer whose family has been distanced from the capital due to the minister's machinations. Melia, Harsherik's wet nurse, hails from Count Luzelia's former territory.
Later chapters reveal Harsherik at five years old, still embodying his "disappointing prince" persona while secretly using his past life's knowledge. Kuro continues as his capable butler, now honing his patisserie skills. Octavian Ordis, nicknamed Orange or Oran, a talented knight, becomes Harsherik's chief knight despite his dislike for the royal family due to past events. Marcus Glacis, the first prince and heir, is depicted as a responsible and kind individual who regrets his estrangement from Oran.
The story then delves into the plight of Baron Armin, who runs an orphanage and is forced into selling drugs to the church to keep it afloat, a situation that tragically impacts his wards, Collette and Rick. Rick, harboring a deep hatred for nobles due to a past accident, mistakenly blames Harsherik for the Baron's death. Ignatz Navy, Oran's former friend, is introduced as a jealous individual involved in the drug trade.
By age six, Harsherik, still a "disappointing prince" externally, is actively working to reform the kingdom with his loyal retainers. The introduction of Weiss, nicknamed Shiro, a powerful and eccentric mage, and Gene Barbass, the illegitimate daughter of Marquis Barbass, who harbors a secret affection for Harsherik, further expands the cast and potential conflicts. The chapters culminate with Harsherik at seven years old, continuing his fight against the kingdom's darkness with his capable team, including the genius strategist Altherize di Roth and the skilled beastkin Gale Fal Kilvi Blau. The overarching conflict involves the corrupt minister Barbass and the kingdom's internal struggles, with Harsherik, despite his perceived weaknesses, strategically navigating these challenges.