On Ventus's 18th birthday, the moment arrives for him to assume leadership from his father, the current Ruler Master Eraqus, and oversee their family and their realm. Yet, his brother, Vanitas, a formidable wielder of dark magic, challenges his claim. Ventus, determined to uphold his birthright, refuses to relent, prompting Vanitas to cast a curse upon him. Now, Ventus is condemned to an existence of solitary anguish, enduring a slow deterioration from a ghastly ailment. Only the power of true love's kiss can shatter the curse, but Ventus harbors little optimism that anyone will come to his aid before the affliction consumes him entirely. Little does he know, the arrival of Roxas, a spirited and determined adventurer, may hold the key to his salvation.