The Seven Deadly Sins, a group of evil knights who conspired to overthrow the kingdom of Britannia, were said to have been eradicated by the Holy Knights, although some claim that they still live. Ten years later, the Holy Knights have staged a coup d'état and assassinated the king, becoming the new, tyrannical rulers of the kingdom. Elizabeth, the king's third daughter, sets out on a journey to find the "Seven Deadly Sins", and to enlist their help in taking back the kingdom.