Umineko no Naku Koro ni: Jessica to Satsujin Senpuuki

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An extra arc originally included in Umineko no Naku Koro ni Hane where Jessica writes a play and shows it off to Battler and Shannon when Lambdadelta interferes and sucks the three of them into it. The trio must see the story to the end if they want to escape alive.

Source: IGDB