The story begins with the protagonist, a nameless individual, finding themselves in a void speaking with a god. The god explains that their previous life ended in a rather embarrassing manner involving a cockroach, a kitchen knife, and a fall, resulting in a "Common" (normal) reincarnation. However, due to the unfortunate death, the protagonist is granted a "Rare or higher" guaranteed gacha for their next life. The god reveals that the protagonist's previous life was unremarkable, living a standard life with no romantic relationships.
The protagonist learns that they will be reincarnated in a different world, as their soul has already been "traded" and its energy returned to their original world. This new world is a standard fantasy setting with magic, monsters, and a status system. The protagonist receives two gacha tickets, which they use to roll for their new life. The first roll yields a golden capsule, which the god reveals is just a visual gimmick, as all capsules are gold. The protagonist pulls a "Super Rare" result, which they initially find underwhelming compared to "Ultra Rare" or "Secret." However, the god explains that Super Rare abilities can be game-breaking. The protagonist's Super Rare ability turns out to be "Toxin Decomposition EX," which grants extreme resistance to all poisons and diseases. While initially disappointed by its perceived mundanity, the protagonist is informed they will be born into a Count's family, a significant step up.
Four years later, the protagonist, now named Ain, has been reincarnated as the eldest son of the Roundheart family, a Count's household. He possesses superior physical abilities and a remarkable aptitude for magic, which he suspects are part of his reincarnation benefits. His father, Logas, is a renowned general, and his mother, Olivia, was a mage at the castle. Ain also has a younger half-brother, Glint, born to a concubine named Alma, who possesses the "Holy Knight" skill and is favored as the heir. Ain's own "Toxin Decomposition EX" skill is publicly known, and while impressive, it's considered less glamorous than Glint's Holy Knight ability. Ain is diligent in his training, focusing on swordsmanship through sheer effort, as he believes his innate skills are lacking. He also develops a strong attachment to his mother, Olivia, and harbors a deep dislike for Alma and his grandmother, Isis, who favor Glint.
During a formal introduction event at the Grand Duke's mansion, Ain and Olivia are initially excluded due to a misunderstanding regarding the guest limit. However, Ain's clever request to view the Grand Duke's garden, coupled with his eloquent flattery of his mother, impresses the Grand Duke and his granddaughter, Krone. Krone, who had heard negative rumors about Ain, is surprised by his politeness and kindness. During their tour of the garden, Ain discovers the "Blue Fire Rose," a flower with potent poison. Using his "Toxin Decomposition EX" skill, Ain is able to extract the poison and transform the flower into a "Star Crystal," a rare gem. This feat astonishes Krone and Olivia, as creating Star Crystals is incredibly difficult and expensive. Olivia reveals her own magical prowess by easily destroying her wedding ring, signifying her detachment from her marriage.
The narrative then shifts to the political landscape of the continent, detailing the major powers: the dominant Kingdom of Heim, the trade city of Birdland, the Republic of Rockdam, and the Duchy of Euro. It is revealed that Olivia is not merely a Count's wife but "Olivia von Ishutalka," the third daughter and former heir to the throne of the unified nation of Ishutalka, a continent far more advanced and powerful than their own. This revelation explains Olivia's immense magical abilities and the reason for her secrecy and eventual departure from the Roundheart family with Ain. The story concludes with Ain and Olivia boarding a massive, advanced ship, hinting at their journey to Ishutalka, leaving behind the political machinations and familial discord of their current world.
