With help from the witch Beatrice, Shannon has enjoyed a budding romance with George Ushiromiya, her master's eldest grandson. As a servant of the Ushiromiya estate, Shannon is little more than furniture, but since her bargain with Beatrice, Shannon has never felt happier...or more human. Her brother and fellow servant, Kanon, is troubled by his sister's reliance on the with to reach beyond her lowly status. But when love begins to flutter in Kanon's heart, will he be tempted to abandon his station and take the witch's hand as well?

Each year, the Ushiromiya family gathers at the secluded mansion of its patriarch, the elderly Kinzo. It has been six years since Battler joined his cousins at the annual event, but their happy reunion is overshadowed by worsening weather and an eerie premonition from his youngest cousin-not to mention their parents' feud over the inheritance. Battler doesn't hold much stock in dark omens, nor does he believe the tales of the witch rumored to have given his grandfather a fortune in gold...and who walks the halls of the mansion to this day... But when the eighteen family members and servants are trapped on the island by the raging typhoon, the grisly events that follow leave Battler shaken to his core. Is one of his relatives desperate enough to kill for the family fortune? Or is this the work of the Golden Witch?

With the six sacrifices of the first night claimed, Beatrice, the Golden Witch, turns her attention to selecting the sacrifices for the second night: the "Two Who Are Close." As the corpses begin to pile up, Battler struggles to disprove that the deaths can only be explained by the existence of magic, and the crafty Beatrice is using every strategy in her playbook to trip him up. Logic and truth perform an acrobatic dance in which a single misstep could spell certain death. Can Battler defeat Beatrice in this match of wits and wills? Or will he find himself kneeling at the witch's feet?!

Six people are dead, and Battler and his remaining relatives slowly come around to addressing the terrifying reality of their situation: Either one of their number is a murderer, or there is a nineteenth person on the island who wants the Ushiromiya family dead. Regardless, the killer seems to be following the inscription beneath the portrait of Beatrice, the instructions for finding the elder Ushiromiya's vast treasure of gold. But each line of the inscription calls for more death, more blood...and the revival of the witch Beatrice herself... Will any remain alive to see the end of this mystery?

Beatrice is dead, her soul shattered by Battler at her own request. Though her body sits across the chessboard, she is no more than a husk of the laughing, impulsive witch she once was. Lambdadelta is more than happy to preside over the fifth game, and Bernkastel willingly steps in for Battler as he takes his leave to collect his thoughts. But two witches can cause all manner of mischief when left to their own devices, especially when they care as little for rules as Lambdadelta...

Time holds little meaning for Beatrice the Millennial Witch. Replaying the events leading up to the Golden Banquet again and again only gives her more opportunity to play with her new favorite toy, Battler Ushiromiya. The boy's will to resist the witch remains strong as the curtain rises for a third time on the Ushiromiya family's annual reunion. But as Beatrice pulls more and more players into the game, the strain on Battler's defenses is evident. Do the other members of his family hold the key to solving the witch's riddle and sealing her defeat?!

The appearance of Gretel has strengthened Battler's resolve to face off against Beatrice once again. Both players have become more skillful tacticians over the course of time, and Battler's new "blue truth" ability, along with Gretel's support, will be a boon to his strategy. As the curtain rises on the fourth game, the Ushiromiya family has gathered on Rokkenjima for their annual meeting. Gretel observes the family she hardly knew with complicated emotions...She must come to terms with the past if she wants to help Battler overcome the Golden Witch!