Umineko When They Cry Episode 4: Alliance of the Golden Witch

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?!
(Source: Yen Press)

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...
(Source: Yen Press)

A compilation of additional tips written by Ryukishi07 outside of the games. Several of the stories are humorous in tone, but the more serious ones may be considered canon.

October 4 and 5, 1986. The Ushiromiya family has gathered on the private island of Rokkenjima for their annual family conference. Chief on the agenda concerns the struggle for the inheritance assets of the ailing family head, Kinzo. But as the family is trapped on the island by a typhoon, they receive a letter claiming to be from the rumored witch of the island, Beatrice, and mysterious events begin to occur.

This chapter introduces Battler's sister Ange as a secondary protagonist, who was absent from the 1986 Ushiromiya family conference and was taken in by Eva, the only survivor of the Rokkenjima Mass Murders. The narrative shifts between the gameboard and the outside world, showing readers the impact of the incident on Ange's life and exploring her relationship with Maria and magic through Maria's diary.