The story begins with a young boy named Ain, who awakens with memories of a past life as a wise man named "Dee." He finds himself reborn as a baby in a world vastly different from modern Japan, lacking electricity, running water, and modern conveniences. This new world has a unique calendar and a four-colored moon system. Ain, retaining his past life's intellect, dedicates himself to learning the local language and the basics of literacy and arithmetic, aiming to become a "prodigy" and leverage his knowledge for an "internal affairs cheat."
By the age of six, Ain has achieved this goal, becoming known as a prodigy in his village due to his advanced understanding of mathematics and accounting, which he uses to assist the village chief with tax calculations. He enjoys a comfortable life, spending his mornings working for the chief and his afternoons playing with Shirley, the chief's granddaughter. However, his peaceful routine is disrupted by his older sister, Iena, who insists he help with farm work.
A significant turning point occurs when Ain, while observing a distant mountain, recalls a song fragment that triggers a realization: this world is not a remote island but another world, akin to a fantasy setting. He then learns about magic when the village chief reveals he uses it to preserve meat. This discovery ignites Ain's desire to learn magic and further solidify his "cheat" abilities.
At seven years old, Ain's life takes a dramatic turn when he realizes this world might be the setting of a popular VR game he played in his past life, "Leon de Ballad's Legend." He tests this theory by attempting to use skills from the game. He discovers that he can activate a physical attack skill, "Cutter," with a simple wooden stick, and later, a touch panel interface appears, allowing him to check his status. His stats are alarmingly low, with HP, MP, and SP at 3, and all attributes at 3, far from the game's initial 10. This suggests he is a minor character, not the protagonist.
Ain's primary goal becomes survival and growth in this potentially dangerous world. He begins training rigorously, focusing on hunting weak monsters like "Lance Rabbits" (Tsuno-usa) to level up. However, these monsters are scarce in his village's vicinity, and the available ones, like "Fortebambi" (Bambi) and "Forteboa" (Forebo), are too strong for his current low stats. He struggles to hunt them, often resorting to strategic retreats and relying on his touch panel for information and item storage.
His training intensifies as he learns to use magic, specifically "Solma," a piercing light magic. He faces numerous challenges, including the limited range and high MP cost of his spells, and the difficulty of finding suitable prey. He also grapples with the limitations of his wooden stick weapon, which breaks easily.
Ain's daily life involves assisting the village chief, playing with Shirley, and enduring his sister's rough treatment. He also faces bullying from other children, particularly Zukka, whom he easily outmaneuvers due to his superior skills. Despite these challenges, Ain remains determined to become stronger, driven by the knowledge that this world might be facing a threat from demons, as hinted by the game's plot. He dedicates himself to training, aiming to overcome his weak stats and protect his loved ones. The narrative highlights his internal struggles, his reliance on game mechanics, and his growing understanding of this new reality.