The story begins with the arrival of a brave young boy in Paris. His ambition is to join the glorious Imperial Guards, but fierce competition and the minimum age requirement hinder him from joining. The boy then challenges the well-known Three Musketeers in order to demonstrate his excellent skills with the sword. However, at the very moment the fight begins, a power-hungry group cuts in. Realizing their wicked intention, the boy D'artagnan and the Three Musketeers quickly cooperate and defeat them. This is the beginning of their friendship and commitment to fight conspiracy.

In 1625, the young D'Artagnan leaves his village in Gascony to embark for Paris with his grandparents' blessings, taking only his father's sword and a letter of introduction. Seeking audience with Tréville, Captain of the Musketeers of the Guard and his late father's comrade, the poor nobleman aims to become a great hero in the service of King Louis XIII. The young adventurer is astonished by the massive size of Paris, but also overwhelmed. He wanders the city streets, befriending a young orphan named Jean. However, he also ends up offending three of the Musketeers of the Guard: Porthos, Aramis, and Athos. Confronted by the Parisian guards over their illegal dueling, D'Artagnan and the Musketeers fend off five of Cardinal Richelieu's soldiers, and the four of them quickly become friends. The four new comrades set off to stop the Cardinal from starting war between England and France, and protect the image of Queen Anne d'Autriche, the wife of Louis XIII. But what will be the cost of their efforts? [Written by MAL Rewrite]