The provided chapters detail the reincarnation of Eric, a man who died by suicide after failing to protect his loved ones, including his beloved Irene. He is reborn as a baby with all his memories intact. Initially, Eric is consumed by despair and a desire to die again, but he refrains out of respect for his new parents, Serena and Dian. He realizes he has been sent back in time, to his own childhood.
Eric dedicates his new life to becoming strong enough to prevent the tragedies of his past. He focuses on training his body and, crucially, his magic. He discovers that his new body allows him to train his magic from infancy, a significant advantage over his previous life where he started training much later. He also begins to develop a close relationship with his childhood friend, Tina, who is his neighbor. Tina is portrayed as a spirited and kind girl who quickly develops a strong bond with Eric, often seeking his company and support.
As Eric grows, he dedicates himself to rigorous training. He practices magic diligently, surpassing his previous life's abilities. He also begins sword training under his father, Dian, a skilled hunter. Dian is a boisterous and proud man who encourages Eric to become strong and a "man." Eric's mother, Serena, is a more grounded and loving figure who often scolds Dian for his rough methods.
A significant turning point occurs when Eric, now eight years old, begins training with his father in the forest. He and Tina, who has also developed magical talent, encounter and defeat a dangerous Red Bear. This event highlights Tina's exceptional magical aptitude, which quickly surpasses Eric's, despite his earlier start. This development causes Eric some internal conflict and regret, as he feels surpassed by his friend, but he also recognizes her potential.
By the time Eric turns sixteen, he has become exceptionally skilled in both magic and swordsmanship, driven by the knowledge of a devastating monster attack that will soon befall his village. He has prepared for this event, but he discovers an unusual absence of monsters in the forest, hinting at something unexpected. The night before the predicted attack, Eric reflects on his past life and the people he lost, reaffirming his determination to protect everyone. He shares his bed with Tina, who has become a constant presence in his life and now calls him "older brother." The narrative ends with Eric preparing to face the impending threat, determined to prevent the tragedies he experienced in his previous life. Tina's perspective is also included, detailing her early encounters with Eric and her growing admiration and reliance on him, culminating in her desire to become an "older sister" figure to him.
