This manga adapts the seventh arc of the Umineko sound novel. In an altered telling where Battler never comes to Rokkenjima and the Golden Witch does not exist, a mysterious child named Lion Ushiromiya holds the place of Ushiromiya heir. Game master Bernkastel summons Willard H. Wright, a mage-hunter, onto her board to answer one question: who killed Beatrice? Will's questioning gathers the loose threads of every prior game and chases the truth behind the witch's origin.