The story begins with Jin being unexpectedly invited to play "Grimoire Online," a new VR game, by his sister, Nana. Despite not applying for the closed beta, Jin finds himself with an access code and a two-hour countdown to the game's launch. Upon logging in, Jin is greeted by a disembodied fairy in a white void, who guides him through character creation. He chooses the name "Jin," alters his appearance slightly by changing his hair and eye color, and then allocates his starting bonus points. He prioritizes Dexterity and invests points into Spirit and Intelligence, aiming to support potential crafting or magic-based production skills, which influences his HP and MP. For his initial skill, Jin chooses "Appraisal" (Lv 1), believing it will be more useful than other options like Swordsmanship, Perception, Concealment, or Gathering, especially given the lack of a tutorial. He receives 2000 Cor as a starting fund.
Jin then finds himself in the "Starting Town," a beautiful cobblestone plaza. He is immediately met by Nana, whose appearance has been altered with purple hair and blue eyes. They become friends and form a party. Nana reveals that the game's developers prioritize realism, meaning no in-game tutorials. Jin discovers his "Grimoire" is listed as "Grimoire of Collection" in his status. They decide to explore the town, noting the medieval-style buildings and NPCs.
Their exploration leads them to a suspicious shop with a sign depicting a grimoire and a hexagram. Inside, they meet an old shopkeeper who explains that the store sells "Skill Books," items that grant new skills upon use. He also mentions that some skills can be found in dungeons or dropped by powerful monsters. Nana then reveals a glowing book she found, which the shopkeeper identifies as a grimoire. He explains that players who can perceive such light are "Grimoire Hosts," a designation historically associated with heroes. As a reward for this revelation, the shopkeeper gifts Jin and Nana Skill Books. Jin uses his book and gains the "Magic Book Arts" (Lv 1) skill, which is essential for operating his grimoire. He also purchases several other crafting and gathering skills, such as "Gathering," "Mining," and "Potion Making" (Lv 1), significantly depleting his funds.
Later, Jin activates his grimoire, which he names "Chronos." This action grants him two unique titles: "Originator of Magic" and "100th Rank Grimoire." These titles provide a +1 bonus to all stats and signify him as the first player to interact with magic. Nana also names her grimoire "Freed." They then head to Rabbit Plains, a starting hunting ground, where Nana uses her "Ice Magic" (Lv 1) and Jin relies on his knife and gathering skills. During their hunt, Jin defeats a "Lucky White Rabbit" and obtains a "Lucky Ring," which, upon equipping, disintegrates and grants him the passive skill "Good Fortune," increasing his Luck stat. He explains this to Nana, who accepts it despite the rule violation.
Returning to town, Jin realizes he needs tools for potion making, requiring more funds. He and Nana split up, with Nana returning to hunt and Jin going back to Rabbit Plains to earn money. While hunting, Jin levels up to Lv 2, gaining a bonus point and increasing his Magic Book Arts to Lv 2. He also notices his Luck stat has increased due to the "Good Fortune" skill. He then ventures into the "Magic Bee Forest," a dungeon known for its insect monsters. After a difficult fight, he defeats a "Big Bee," leveling up to Lv 4 and gaining two more bonus points. He obtains a "Stumbling Ring," a seemingly useless item, which he stores in his grimoire using the "Collection Card" ability. He also notes that his grimoire's rank has updated to "87th Rank."
Meanwhile, behind the scenes, game staff are in an uproar because Jin's "Grimoire of Collection" was obtained during character creation, an event that should have been impossible due to its stringent requirements. They realize this grimoire is incredibly powerful, potentially capable of defeating all current bosses, and decide to adjust its evolution path to prevent it from becoming too game-breaking.