Leonard, Yuile and their new friend are delivering wine to a banquet in honor of Princess Cisna of Balandor. When the banquet is raided by Magi and the king is slain, Leonard escapes with Cisna finds a suit of armor called the Incorruptus. Leonard dons this armor to become the White Knight to fight back against the Magi, but in the ensuing battle, Cisna is abducted, leaving Leonard and his companions to venture out to rescue her.

White Knight Chronicles is a role-playing game with an online questing mode. The player creates their own avatar with whom they interact with the main story. Combat is real-time, with each character's abilities chosen from customizable quick menus, with options for chains by assigning multiple abilities to the same slot. The online mode takes cues from Dark Cloud; players found and manage their own town from which they can invite other players with whom to take quests together.