The protagonist, Takuhir, is a young baron who suffers a tragic fate. In his second life, he loses his family and his land to successive calamities and is ultimately executed at the age of twenty, labeled an incompetent failure. However, at the moment of his death, he awakens to a powerful space-time magic, which transports his consciousness back to his childhood. It is then that he makes a startling discovery: this is not merely a second chance at life, but his third life altogether.

Takuhir now possesses the accumulated memories of three distinct existences: his current life as a baron's son, his previous tragic second life in this fantasy world, and his original first life as an ordinary person from modern Japan. Armed with the historical knowledge of what went wrong in his second life and the technological understanding of modern civilization from his first, he resolves to change the course of history. His primary goal is no longer simply to survive, but to actively save his beloved family and avert the disasters that once destroyed everything he held dear.

The story takes place in the Solis barony, a small and unfortunate domain within the larger Kair Kingdom. Takuhir begins his third life as the second son of the baronial family. Because he regresses to his birth, he is initially a child with no political power. Unable to rely on overwhelming force, he instead implements steady and practical reforms. He invents essential technologies such as improved waterwheels and dried noodles to combat the predicted famines, strengthening the barony's economy and food security one step at a time. He also uses his foreknowledge to identify and recruit talented individuals who will become crucial allies, including a person who recognizes his unconventional actions and steel will.

The narrative arcs center on Takuhir's methodical efforts to prevent specific tragic events. He works to support his parents, who struggle with countermeasures against famine, and aims to save his older brother from a predetermined death in battle. Each challenge he overcomes creates ripples that extend beyond his household, as his success in altering local history begins to affect the political landscape of the entire kingdom and eventually the continent. The central conflict pits Takuhir's determination and accumulated wisdom against a seemingly immutable tragic history, exploring whether an ordinary man with extraordinary knowledge can successfully rewrite his family's dark destiny.