The story begins with Shiina Ren, a university student and avid fantasy fan, who has just achieved the world's fastest clear time for the highly anticipated RPG, "Legend of the Seven Heroes II." As a reward for his achievement, he receives a special download content, which he eagerly installs. While waiting, Ren browses the game's official website, recalling the game's plot: a sequel set centuries after seven heroes defeated a demon lord, focusing on their descendants at an academy. The first game revealed the protagonist was the last descendant of the Seven Heroes, and the second game escalated the conflict with a friend betraying the protagonist, killing a saint and the academy headmaster. The ending of "Legend of the Seven Heroes II" left the demon lord's revival plot unresolved, with the emperor ordering the friend's pursuit.
Ren decides to start a second playthrough to explore the game's extensive replayability, including a unique skill customization system that allows players to combine skills and rename them, with the caveat that "unique skills" are disallowed. He becomes obsessed with finding a hidden skill, trying numerous combinations without success. He then searches online and finds posts from other players discussing the game's ending and potential villains for the next installment. After a frustrating search, Ren accidentally discovers the hidden skill "Demon Sword Summon" by combining "Swordsman," "Dark Magic," and "Summoner." However, the system informs him that this is a unique skill and cannot be used in normal mode, leading to his disappointment. A new option appears: "Start a Special Story." Upon selecting it, Ren is enveloped in light and loses consciousness.
Ren awakens to the sensation of being bathed in warm water, unable to open his eyes or move. He hears two women's voices, one elderly and one younger, discussing him. The experience is too vivid for a dream, and he realizes with a jolt that he might have been reincarnated, recalling the "special download content" and "special story" from the game. He deduces he has become an infant and, to his shock, learns his name is Ren Ashton, the protagonist's friend from "Legend of the Seven Heroes II," a character destined for a grim fate.
Months pass, and Ren, now seven years old, has accepted his reincarnation as Ren Ashton. He lives in a modest house in a remote village with his parents, Mireille and Roy Ashton, a knight. Ren's father, Roy, is a skilled hunter and warrior who provides for the family and village. Ren's primary goal is to live a peaceful life and avoid his game counterpart's tragic fate. He diligently trains his "Demon Sword Summon" skill, which he can now use with an inherited bracelet. He discovers that the skill's effectiveness and his own physical abilities improve with effort and practice, though the path to leveling up is arduous.
The narrative then shifts to the arrival of Weiss, the knight commander of Baron Clausel, the Ashtons' liege lord. Weiss informs Roy that a D-rank monster has appeared near the village, posing a significant threat. Roy, despite his exhaustion from hunting to protect the village, is determined to defend it. Ren, having overheard this, insists on helping, revealing his strength and skill to Weiss, who is impressed by the young boy's abilities and intellect. Weiss acknowledges Ren's potential and the danger posed by the monster, a "Thief Wolfen," known for its speed and thieving abilities, which is unusual for the area.
The story culminates with Roy being gravely injured by the Thief Wolfen while hunting. Ren, witnessing his father's plight, bravely confronts three Little Boars, demonstrating his enhanced combat abilities gained through training and his "Demon Sword Summon" skill. He successfully defeats them, saving his mother and father. Mireille, realizing Ren's strength, rushes to get the village midwife, Rig, who has healing skills. Ren, now understanding the severity of the situation and the threat of the Thief Wolfen, resolves to protect his village, accepting his duty as a member of the Ashton family. He realizes that his father's injuries were likely caused by the Thief Wolfen, which appeared closer to the village than expected. Ren, despite his young age, is determined to face this new threat, understanding that his unique skills are now crucial for his family and village's survival.
