Umineko no Naku Koro ni: Gisho no.XXX

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An extra arc originally included in Umineko no Naku Koro ni Hane where Battler Ushiromiya returns to Rokkenjima after a six-year absence, but instead of having a friendly reunion with his family, he has plans of murder. This episode explores darker themes and diverges from the canonical timeline, offering fans a speculative “what-if” story.

Source: IGDB