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The curtain fell long ago on a forgotten theater. The lights, the music, the applause — all of it stands frozen in the dark. Backstage, two girls wake without their memories — Aleph, who takes the director's chair, and Liora, who takes the stage. Only her voice can raise the curtain again. Nientum - Op.ZERO is a 2D rhythm-action adventure where every stage is a performance. Backstage platforming flows into live performance in the spotlight, and at every turning point of the story, boss battles unfold as duets you win by keeping time. Rhythm becomes the script, and your choices decide how the final curtain falls. Voice is half of this theater: a full Japanese dub by Chika Anzai, Yuki Takada, and Takehito Koyasu. Game Features - A rhythm game where music, platforming, and story become one stage - Boss duets fought in rhythm at the story's turning points - Text in five languages - Start free — the opening chapters are free, with a single unlock for the full theater First released on PC in Early Access. Excellence in Audio at BIC 2024. Selected for TGS 2026 SELECTED INDIE 80. And on October 14, 2026 — with Chapters 6–10 added — the theater finally opens in full.